iOS Remote Support
You can pair an iPhone or iPad with the Apple TV using the iOS Remote app (installed via the App Store) so that you can control the Apple TV with your iPhone or iPad. This allows iOS apps to use those paired devices as controllers. See https://support.apple.com/en-us/HT201664 for more information.
Scott Harrison commented
Just use the auto lan plugin
Tony Godfrey commented
This feature would allow users to connect multiple iOS devices to an Apple TV which can then be used as game controllers in multiplayer scenarios.