When you do, I'll be eager to try it, as I currently rely on FlightAware's local web display to show my 3 year old what planes our antenna is picking up.
I just realized I have the transform of the dump1090-fa data to MQTT message already written up:
https://github.com/idatum/adsb2mqtt
What's missing is the client that enhances flight info and uses TTS to play the generated wave.
I also wanted to play around with Home Assistant's TTS.
I'll get motivated to write this up more fully, blog style.