Got it, just need to add new node to UserManager collection.
const USER_MANAGER_COLLECTION = 'UserManager';
static private $USER_MANAGER_CUSTOM_FIELD_CONFIGURATION = array(
'accessModel'=>self::ROLE_VIEWER,
'publishModel'=>self::ROLE_VIEWER,
'persistItems'=>true,
'modifyAnyItem'=>false,
'userDependentItems'=>true,
'sessionDependentItems'=>false,
'itemStorageScheme'=>self::STORAGE_SCHEME_MANUAL,
'allowPrivateMessages'=>true,
'lazySubscription'=>false,
'p2pDataMessaging'=>false
);
const USER_INVITE_ID_CUSTOM_FIELD = 'inviteId';
static private function createUserManagerCustomFields($room){
$account = self::init();
$collection = self::USER_MANAGER_COLLECTION;
$account->subscribeCollection($room, $collection);
$account->createNode($room, $collection, self::USER_INVITE_ID_CUSTOM_FIELD, self::$USER_MANAGER_CUSTOM_FIELD_CONFIGURATION);
}
