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  • I was based on your reply and create something like that.

    function filter_image_send_to_editor($html, $id, $caption, $title, $align, $url, $size, $alt) {
      $attr = get_field('CUSTOM FIELD NAME', $id);
      
      if ($attr !== NULL) {
        $html = str_replace('<img ', '<img data-attr="'. $attr .'" ', $html);
      }
      return $html;
    }
    add_filter('image_send_to_editor', 'filter_image_send_to_editor', 10, 8);

    This solve my problem. Thanks again for help 🙂