不幸的是，目前还没有API，甚至没有参数可以用来安排通知。

Unfortunately, as of the moment, there is no API or even a parameter that you can use in order to schedule a notification.

它只能在Firebase控制台中完成（如您所知）或在您自己的App Server中执行延迟直到该计划。

It can only be done either (as you already know) in the Firebase Console or implementing a delay until the schedule in your own App Server.