Show drupal message in form ajax callback

$this->messenger()->addMessage($this->t('System tag can be added only automatically'), 'error', TRUE);
$message = [
 '#theme' => 'status_messages',
 '#message_list' => $this->messenger()->deleteAll(),
];
$messages = \Drupal::service('renderer')->render($message);
$response->addCommand(new AppendCommand('.region--highlighted', $messages));