JIG show (custom) taxonomy terms as image title

functions.php

<?php

add_filter('jig_images', 'change_jig_captions', 10, 2);
function change_jig_captions($images, $atts)
{
    foreach ($images as &$image) {
        if (empty($image['extra_class']) || strpos($image['extra_class'], 'jig-contentID-ML-') === false) {
            break;
        }
        if (preg_match('/(\d)+/i', $image['extra_class'], $regs)) {
            $id = $regs[0];
        } else {
            break;
        }
 
        $tags = get_the_terms($id, 'post_tag');
        if (!empty($tags)) {
            $bare_tags = [];
            foreach ($tags as $tag) {
                $bare_tags[] = $tag->name;
            }
            $image['title'] = esc_attr(implode(', ', $bare_tags));
        }
    }
    return $images;
}