how do i put Apple tv on my Vizio

appletv app is an app for some smart tvs https://www.apple.com/apple-tv-app/devices/

apple also make an appletv box which works with all tvs https://www.apple.com/apple-tv-4k/

The Apple TV app is coming to the Vizio platform in the future (“later this year”). In the meantime, customers with AirPlay 2 enabled VIZIO Smart TVs can play Apple TV+ original shows and movies from the Apple TV app on iPhone, iPod touch, or Mac directly to their smart TVs.

Users of unsupported models TV can use an external streaming device, like the Apple TV set-top box, Roku, or Fire TV.

Devices you can use with the Apple TV app and Apple TV+ - Apple Support