Select dependent with multi-select

Hello, i have implemented this codesnippet to create a dependent select and it works; however i would like to implement multi-select. Any idea yo solve it? I tried but it disable the filter!

// Filter to initialize the second select (lessons) as empty
add_filter('fluentform/rendering_field_data_select', function ($data, $form) {
    if ($form->id != 91) {
        return $data;
    }

    // If it's the second select (lessons), we initialize it empty
    if (\FluentForm\Framework\Helpers\ArrayHelper::get($data, 'attributes.name') == 'lesson_select') {
        $data['settings']['advanced_options'] = []; // Initially empty the options
    }

    return $data;
}, 10, 2);

// AJAX handler to load lessons based on the selected course
add_action('wp_ajax_update_lesson_select', 'update_lesson_select');
add_action('wp_ajax_nopriv_update_lesson_select', 'update_lesson_select');

function update_lesson_select() {
    // Verify and get the course ID
    $selected_course_id = intval($_POST['selected_course_id']);
    if (!$selected_course_id) {
        wp_send_json_error('Invalid course ID');
    }

    // Get the lessons that belong to the selected course
    $lessons = get_posts([
        'post_type'   => 'sfwd-lessons',
        'meta_query'  => [
            [
                'key'     => 'course_id',  // Make sure this meta field exists and links lessons to courses
                'value'   => $selected_course_id,
                'compare' => '='
            ]
        ],
        'numberposts' => -1
    ]);

    // Check if lessons were found
    if (empty($lessons)) {
        wp_send_json_error('No lessons found for the selected course');
    }

    $options = [];
    foreach ($lessons as $lesson) {
        $options[] = [
            'label' => $lesson->post_title,
            'value' => $lesson->ID
        ];
    }

    // Send options as the AJAX response
    wp_send_json_success($options);
}

// Add JavaScript to the footer to handle the change in the course select
add_action('wp_footer', function() {
    ?>
    <script>
    jQuery(document).ready(function($) {
        // Change in the course select
        $('select[name="course_select"]').on('change', function() {
            var selectedCourseId = $(this).val();

            // AJAX request to update the lesson select
            $.ajax({
                url: '<?php echo admin_url('admin-ajax.php'); ?>',
                method: 'POST',
                data: {
                    action: 'update_lesson_select',
                    selected_course_id: selectedCourseId
                },
                success: function(response) {
                    var $lessonSelect = $('select[name="lesson_select"]');
                    $lessonSelect.empty();

                    if(response.success) {
                        // Add options to the lesson select
                        $.each(response.data, function(index, option) {
                            $lessonSelect.append(new Option(option.label, option.value));
                        });
                    } else {
                        alert('Error: ' + response.data);
                    }
                }
            });
        });
    });
    </script>
    <?php
});