Everything involving audio is an annoying mess.

The first step is getting speakers in a room: there are tons of products that do this, apple, google, Sonos.

Most of them have the audio quality of a bag of instruments.

There are tons of class D amps that you can hook up to speakers: Wiim, acrylic and so on... this will run you anywhere from 100 bucks to 500 and thats before you buy the speakers. Most of these will be great for playing music and projecting your voice.

The moment you involve a TV... well things get ugly because your going to want arc for HDMI and your going to want a center channel cause with out it your likely in subtitle hell half the time. This will get expensive a Sonos sound bar is a few hundred and if you want something better well... Let's say you can get to the point of making a GPU look affordable real quick.

Now that you can play audio, how do you hear it... well your phone works and there are tons of satellites out there.

You're now going to need to run home assistant to "interrupt" what ever is playing (if something is) to play your message and then return what ever it was to its current state.

After trying out WIIM, Acrylic, some high end stereo gear I just settled on half assed audio quality and bought more Sonos gear. I kept a single WIIM unit, cheap amp, decent speakers and a sub around for when I want to really listen to music but other than that I tolerate sonos' middling quality for day to day use (and I am, by no means an audiophile).