Is there an app to listen to TV?

Can you listen to TV via bluetooth?

Android TV/Google TV: Bluetooth Just like with Fire TV (which itself is based on Android), Android TV and Google TV devices can pair with Bluetooth devices. This means you can use your Bluetooth headphones with any Android TV-powered Hisense or Sony model, or an Nvidia Shield TV or TiVo Stream 4K media streamer.

Can you listen to your TV through your phone?

https://www.youtube.com/watch?v=3H2PrYJEUug