/**
 * Implements hook_theme_suggestions_form_element_label().
 */
function boots_theme_suggestions_alter(array &$suggestions, array $variables, $hook) {
  $node    = \Drupal::routeMatch()->getParameter('node');

  if ($node instanceof \Drupal\node\NodeInterface) {
    $type = $node->getType();
    if ($type == 'form') {
      $suggestions[] = $hook . '__' . $type;
    }
  }
}