I tried to set a IFTTT applet like “if receive an email, then google assistant say…” but google assistant service can’t be added as actions, so IFTTT
Recently Google home app has online their routine, but I can’t choose my smart device as trigger, and it doesn’t provide an action like “let speaker say… I think it could be supported to do that in the future.
Hope my study can help you.
Alexa can’t detect the RF sensors as a trigger for a routine as it can with other sensors. I don’t use Google Asistent but I would think the same would occur. In a similar situation to this (an old wired doorbell) at home I paired it to RF chime.