Custom ID for Fullscreen Slider / alle ALB elements

Hi,
I want to use the Fullscreen Sub Menu on a site with some Fullscreen Sliders.
I tried to define some anchors, so i can use these in the Fullscreen Sub Menu.
I’ve found this thead https://kriesi.at/support/topic/create-custom-div-id-field-for-all-avia-layout-builder-elements/#post-584257`

<div id="my-custom-id"></div>
When I use this, some spaces appear between my sliders.

So I tried to give the Fullscreen Slider element an ID.
But this doesn’t have any effect.

 function avia_custom_element_id(){
?>
 <script>
jQuery(window).load(function(){
jQuery('.your-custom-class').attr('id','your-custom-id');
});
 </script>
<?php
}
add_action('wp_footer', 'avia_custom_element_id');

I see an additional field “Custom CSS class” now, but there’s no field “Custom CSS ID”

Here’s the complete functions.php from my child theme folder.
Did I make a mistake here?

<?php

/*
* Add your own functions here. You can also copy some of the theme functions into this file. 
* WordPress will use those functions instead of the original functions then.
*/

//add custom class for alb
add_theme_support('avia_template_builder_custom_css');

function avia_custom_element_id(){
?>
 <script>
jQuery(window).load(function(){
jQuery('.your-custom-class').attr('id','your-custom-id');
});
 </script>
<?php
}
add_action('wp_footer', 'avia_custom_element_id');