Query advanced select field by relationship

I still don't have the solution - this is still not working as wanted and assistance is still needed.

I was able to query courses connected to an event; but, only by manually inputting the Post ID. See below:

<?php
add_filter( 'rwmb_meta_boxes', 'qrsi_select_advanced' );

function qrsi_select_advanced( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'      => __( 'QRSI2', 'your-text-domain' ),
        'id'         => 'qrsi2',
        'post_types' => ['events'],
        'include'    => [
            'relation'       => 'OR',
            'event-category' => [15],
        ],
        
        'fields'     => array(
            array(
                'name' => __( 'Courses Block 1', 'your-text-domain' ),
                'id'   => $prefix . 'courses_block_1',
                'type' => 'post',
                'post_type' => 'course',
                'field_type' => 'select_advanced',
                'placeholder' => __( 'Select an Item', 'your-text-domain'),
                'query_args' => array(
                    'relationship' => array(
                        'id'   => 'event-to-course-relationship',
                        'from' => 60,
                    ),
                    'post_status' => 'publish',
                    'posts_per_page' => - 1,
                    'order' => 'ASC',
                    'orderby' => 'name',
                )
            )
        )
    ];

    return $meta_boxes;
}

?>

Neither get_the_ID() or get_queried_object_id() worked. I was unable to figure out the $from and $to IDs mentioned in the documentation – there were no examples that showed how to find what the or what they would be. It just said to use them, which isn't a useful direction to provide. Nonetheless, I tried from_event-to-course-relationship and event-to-course-relationship_from as options. Neither worked.

Manually inputting the events doesn't really work for this purpose. What's the correct way to do this?

I appreciate the concern behind the reasoning of why; but, right now, I need the how more than anything. I can further expand on the reason after I get this code working as intended.

Thank you.

Thank you so much – this worked perfectly. I submitted the link to the old rendition of the website if you want to take a look at the setup. I can explain further why I feel this was the best choice if you'd like.

I was also able to filter the other Advanced Select field based off scholars linked to courses using some additional code:

$course_args = array(
        'post_type' => 'course',
        'relationship' => array(
            'id'   => 'event-to-course-relationship',
            'from' => $post_id,
        ),
    );
 
    $course_query = new WP_Query($course_args);
 
    if ($course_query->have_posts()) {
 
        while ($course_query->have_posts()) {
 
            $course_query->the_post();
 
            $course_post_id = get_the_ID();
        }
    }

And:

'query_args' => array(
                            'relationship' => array(
                            'id'   => 'from-course-to-scholar',
                            'from' => $course_post_id,
                        ),

The whole code is located here:
https://pastebin.com/4sayJwyR

Thank you again for your help. And just to make sure, is there anything wrong with the code I used? Will it cause any errors?