I would like to know if there is a fast way for manage multiple notification services and only make one call to one “master notify service” … I want to use this because I have multiple google home mini for tts notifications and I would like to use one or all using presence sensors.
Yes there are ways to do this.
I re-used a principle I found from @anon43302295 many months ago. Look for his GitHub repo for inspiration.
The principle is to pass a central script parameters that it will use to direct the message to the right place or places, be that one or more google home minis, some kind of mobile messaging app or even an HA persistant notification.
There is also another ‘project’ which might be useful to look at - Janet (The Good Place)