Configure the (+) Add button in k-structure-field

I just playing arround with the Kirby UI Kit and stumbled upon the k-structure-field.

Given

<k-structure-field
    v-model="value"
    :required="true"
    label="Structure"
    name="structure"
    help="This is a structure field"
    @input="input"
/>

Result

How the heck do I configure the (+) Add Button to open a dialog? if I click the Button I get can't convert undefined to object error.

Also if I add :fields like and click an the empty state

 <k-structure-field
      v-model="value"
      :required="true"
      :fields="{
        name: {
            label: 'Name',
            type: 'text'
        }
      }"
      label="Structure"
      name="structure"
      help="This is a structure field"
      @input="input"
    />

I get an t.endpoints is undefined error.

As a side note this view is renderd in a custom panel plugin.