Editable structure field previews for custom block

In the screencast, @bastianallgeier says, there can be defined multiple blocks in the index.js. I try to setup the second block but it only appears rudimentary. When I call up the block editor in the panel, not even the correct name of the block is displayed. Did I miss a semicolon or something else? <k-code>{{ content }}</k-code> gives an empty black field with two brackets.

panel.plugin("tillcremer/kirby-index-theme-blocks", {
    blocks: {
        textblock: {
            methods: {
                editHeading(value) {
                    this.update({
                        heading: value
                    });
                },
                editToggle(value) {
                    this.update({
                        toggle: value
                    });
                },
                editText(value) {
                    this.update({
                        text: value
                    });
                }
            },
            template: `
                <section class="k-block k-block-type-textblock">    
                    <k-grid variant="fields">    
                        <k-box theme="empty" style="--width: 3/4">         
                            <k-writer-input
                                name="writer"
                                :autofocus="true"
                                :placeholder= "field('heading').placeholder"
                                :value="content.heading"
                                @input="editHeading"
                                style="--width: 3/4"
                            />     
                        </k-box> 
                        <k-box theme="empty" style="--width: 1/4">
                            <k-toggle-input 
                                name="toggle" 
                                :value="content.toggle" 
                                @input="editToggle"
                                style="--width: 1/4"
                            />   
                        </k-box>
                        <k-box theme="empty" style="--width: 1/1">
                            <k-writer-input
                                name="writer"
                                :autofocus="true"
                                :placeholder="field('text').placeholder"
                                :value="content.text"
                                @input="editText"
                            />    
                        </k-box>                      
                    </k-grid>           
                </section>
            `
        },
        tableblock: {
            methods: {
                editHeading(value) {
                    this.update({
                        heading: value
                    });
                },
                editToggle(value) {
                    this.update({
                        toggle: value
                    });
                },
                editTableField(value) {
                    this.update({
                        text: value
                    });
                }
            },
            template: `
                <section class="k-block k-block-type-tableblock">   
                     <k-grid variant="fields">    
                        <k-box theme="empty" style="--width: 3/4">         
                            <k-writer-input
                                name="writer"
                                :autofocus="true"
                                :placeholder= "field('heading').placeholder"
                                :value="content.heading"
                                @input="editHeading"
                                style="--width: 3/4"
                            />     
                        </k-box> 
                        <k-box theme="empty" style="--width: 1/4">
                            <k-toggle-input 
                                name="toggle" 
                                :value="content.toggle" 
                                @input="editToggle"
                                style="--width: 1/4"
                            />   
                        </k-box>                  
                    </k-grid>   
                    
                    <!--
                    <div class="k-table">
                        <table>
                            <thead>
                                <tr>
                                    <th class="k-table-index-column">#</th>
                                    <th>Name</th>
                                    <th>Email</th>
                                    <th>URL</th>
                                    <th>Date</th>
                                    <th class="k-table-options-column"></th>
                                </tr>
                            </thead>
                            <k-draggable
                                :handle="true"
                                :options="{
                                    fallbackClass: 'k-table-row-fallback',
                                    ghostClass: 'k-table-row-ghost'
                                }"
                                element="tbody"
                            >
                                <tr v-for="i in 2" :key="i">
                                    <td class="k-table-index-column" data-sortable="true">
                                        <span class="k-table-index">{{ i }}</span>
                                        <k-sort-handle />
                                    </td>
                                    <td>Kirby</td>
                                    <td>mail@getkirby.com</td>
                                    <td>https://getkirby.com</td>
                                    <td>2023-09-25</td>
                                    <td class="k-table-options-column">
                                        <k-options-dropdown :options="options" />
                                    </td>
                                </tr>
                            </k-draggable>
                        </table>
                    </div> 
                    -->
                </section>
            `
        }        
    }
});
<?php 

Kirby::plugin('tillcremer/kirby-index-theme-blocks', [
  'blueprints' => [
    'blocks/textblock' => __DIR__ . '/blueprints/blocks/textblock.yml'
  ],
  [
    'blocks/tableblock' => __DIR__ . '/blueprints/blocks/tableblock.yml'
    ]
  ]);
name: Table Block with Heading
type: tableblock
icon: table
fields:
  heading:
    label: Heading
    type: writer
    inline: true
    width: 3/4
    required: true
    placeholder: Heading
    nodes: false
    marks:
      - italic
      - underline
      - strike
      - sub
      - sup
      - clear
  toggle:
    label: false
    type: toggle                
    text: 
      - hide
      - show
    default: true  
    width: 1/4  
  table:
    label: Table
    type: structure
    fields:
      date:
        label: Year or Time Span
        type: text
        pattern: "[0-9]{4}|[0-9]{4}–[0-9]{4}"
        translate: false
        placeholder: "2020–2022"
        width: 1/4
      item:
        label: Story
        type: writer
        nodes: false
        marks:
          - italic
          - underline
          - strike
          - sub
          - sup
          - clear
        width: 3/4