Sort pages by field value – stuck with JSON representation

The CMS Questions
3

That’s what I was thinking conceptually but I have trouble with the correct code/syntax. For now I am trying another, simpler approach that doesn’t involve the above mentioned repo or JSON. I am now just working with the Kirby API.

These are the approaches I’ve tried to far (based on the same blueprint as above).

Using pluck() (which might not be right because I will then have to loop through these dates?):

<?php foreach($page->children()->listed()->toPages()->terminitemtermine()->toStructure()->pluck('termindate') as $date): ?>
     <?= $date ?>
<?php endforeach ?>

Using collections:

site/collections/termindates.php

<?php 
return function ($site) {
    return $site->find('termine')->children()->listed()->toPages()->terminitemtermine()->toStructure()->termindate();
};

In the snippet

<?php foreach($kirby->collection('termindates') as $date) {
     echo $date->html();
} ?>

Also tried something along the lines of this post: Getting specific page children structure field - #6 by ryuchix

But no luck so far. It mostly tells me “Call to a member function terminitemtermine() on null”. How do I get into the children pages? What am I missing?