Add ability to default open in new window to on

Our users just asked for this feature. Can you provide a clue as to what that one line of JS would be?

I also need a default setting for "open in new window"... in fact, it would be best (at least for me) if I could set that as default for all links and then disallow the end user from modifying that setting.

/**
 * Implements hook_editor_js_settings_alter().
 */
function <module_name>_editor_js_settings_alter(array &$settings) {
  foreach ($settings['editor']['formats'] as &$format) {
    if (!empty($format['editorSettings']['config']['link']['decorators'])) {
      foreach ($format['editorSettings']['config']['link']['decorators'] as &$decorator) {
        $target = $decorator['attributes']['target'] ?? FALSE;
        if ($target === '_blank') {
          $decorator['defaultValue'] = TRUE;
        }
      }
    }
  }
}