I don't use Apple products but I have played a little with wife's iPhone and the Shortcuts app. I don't know if Shortcuts can use an incoming notification as a Trigger but I do know it can send an HTTP request. I setup one that sends HTTP Requests based on battery level of phone. So, when iPhone receives the notification, it sends an HTTP request as a cloud/local trigger to RM or to Maker API address.
I do similar using Tasker App on Android (not available for Apple) for some things like Eufy doorbell and Amcrest cameras that don't have direct integration with HE.
The theory would be similar for iPhone Shortcuts and is described in this thread about Eufy doorbell:
HOWEVER, if iPhone Shortcuts won't allow you to use a received notification as a trigger, then everything I just wrote is MOOT! 
