Airplay to display on tv screen while using an app

Does your TV support Airplay? This link leads to a list of all models of TVs that support airplay. Is your TV on this list?

Home app - Accessories - Apple

If your TV supports Airplay here's some info on how to get it turned on:

1. Connect your iPhone to the same Wi-Fi network as your Apple TV 4K , AirPlay-compatible smart TV, or Mac.
2. Find the video that you want to stream.
3. Tap AirPlay . In some apps, you might need to tap a different button first. For example, in the Photos app , tap Share , then tap AirPlay.
4. Choose your Mac or TV from the list.
5. To change the playback destination, choose a different AirPlay option on your iPhone screen.
6. To show video playback controls on the Mac, move the pointer over the video playing on the Mac screen.

To stop streaming, tap AirPlay in the app that you’re streaming from, then tap your iPhone in the list.