hook_preprocess_menu ($variables){
  $$menuItems = &$variables['items'];
  foreach ($menuItems as $idx => &$item) {


   $idx = explode(":",$idx);
   $i = \Drupal::entityTypeManager()->getStorage('menu_link_content')->loadByProperties(['uuid' => $idx]);
   $i= reset($i);
   $idParent = $i->getParentId();
   $idParent = explode(":",$idParent);
   $parent = \Drupal::entityTypeManager()->getStorage('menu_link_content')->loadByProperties(['uuid' => $idParent]);
   $parent= reset($parent);
 
  
   $j = MenuLinkContent::load($parent->id());
 
  
  $highlited = $j->field_highlighted_id->value;
  
  }