For instance I want HA to announce that the garage door is opening. I already have the door monitored and can control it via HA.
I have HA integrated with Alexa via Nabu Casa but it appears to be a one way thing where she can ask HA to do something via NC but HA can’t ask her to do something…like announce “The Garage Door is Opening.”
Text-to-speech (TTS), perhaps?
Create an automation that gets triggered by the garage door being open, and use TTS as the action. Play it on a media player entity you have connected to HA.
I didn’t know that TTS existed. I’ll have to look that up.
They included many voice inprovements in the latest releases. Check out the release notes.