Open the Settings app on your Google TV or Android TV. Scroll down and select System. Go to Apple AirPlay & HomeKit option.

To mirror your Android's screen, you'll need a Chromecast, a compatible TV, or a third-party app like Tenorshare Phone Mirror.

That being said, if you plan to install any other apps in order to stream from your PC to your Android phone, make sure they come from a trusted source or you can otherwise verify their legitimacy.