Multiselect uuid to title

The CMS Questions
1

I’m looking for a solution to use a multiselect and keep the uuid as value in it for the frontend - But I want to show the title in the panel.

          publishedProducts:
            label: Veröffentliche Produkte
            type: pages
            parent: site.find('produkte/produkte')   
            layout: table
            templates: 
              - product
            columns:
              title:
                label: Title
                width: 1/6
              solution:
                label: Lösung
                width: 1/6
                value: "{{ site.find(page.solution).title }}"
              category:
                label: Kategorie
                type: tags
                width: 3/6
                value: "{{ page.relatedCategoryPanelSummary }}"

    productcategory:
        type: fields
        fields:
          category:
            label: Produkt Kategorie
            type: multiselect
            options: query
            query:
              fetch: site.find('produkte/kategorien').children.listed
              value: '{{ page.uuid }}'
              text: '{{ page.title }}'

<?php

use Kirby\Cms\Page;

class ProductPage extends Page
{
    public function relatedCategoryPanelSummary()
    {
        $titles = [];
        $categories = site()->children()->filterBy('uuid', 'in', [$this->category()]);
        foreach ($categories as $category) {
            $titles[] = $category->title();
        }
        return implode(', ', $titles);
    }
}

So the models/product.php pass data - If i just use

return $this->category();

I see the normal output - but I want the title.

Bildschirmfoto 2025-06-05 um 16.08.12
Bildschirmfoto 2025-06-05 um 16.08.12446×337 5.6 KB

Maybe someone have a hint for me?

2

Sometimes a small break helps → 

<?php

use Kirby\Cms\Page;

class ProductPage extends Page
{
    public function relatedCategoryPanelSummary()
    {
        $titles = [];
        
        // Multiselect use seperator
        $categories = $this->category()->toPages(',');
        
        foreach ($categories as $category) {
            $titles[] = $category->title();
        }
        
        return implode(', ', $titles);
    }
}