Custom Module: right place to load options for Field Select dynamic before Module rendering

Hello everyone,
I want to create a select field in a custom module with a query via WP_Query and custom fields, and a sorting by menu items:

'items_list' => array(
                        'type' => 'select',
                        'label' => __( 'Items', 'fl-builder' ),
                        'default' => '',
                        'options' => getItems(),

Here is the query:

$args = array(
            'posts_per_page' => -1,
            'post_type' => 'cpt_items',
            'suppress_filters' => true,
            'post_parent' => 0,
            'fields' => "ids",
            'orderby' => 'menu_order'
        $items = new WP_Query($args);

Where or how do I have to store the query? In the FLBuilderModule class, the query does not give me the correct results, e.g. the sorting “menu_order” is ignored etc.

Is it generally possible to dynamically set the options for a select field in an “FLBuilder::register_module”?

Many Thanks

WP_Query returns a WP_Query object, inside that object is the results of your query, you need to use that and loop them so the options is a name/value array. Plenty of examples in the modules folder.