Apple TV app is now available on Google Play Store for Android TV
Download apps on your Apple TV - Apple Support
How to enable Automatic Downloads for Apple TV apps
How to Use the App Store on Apple TV - MacRumors
Get movies and TV shows from the Store in the Apple TV app on Mac
How to Update Your Apple TV and All the Apps on Your Device
LG TV - How to Install/Delete Apps on My LG Smart TV
App Store on Apple TV - Apple Community
Search in the Apple TV app on Mac - Apple Support
Can You Install Apps on the Apple TV?