What is the minimum requirement for showing "game controller optional" in App Store?

Developing a game with Unity for the Apple TV 4th generation, we are using a plugin that supports gamepads without the need of any XCode game controller framework.

What is the minimum necessary setup in XCode for the App Store to show that gamepads are supported?

The following Mac Developer Library page does not tell very much about it, but the screenshot shows, that at least the necessary plist key is added when turning "Game Controllers" on, but seem to not suffice for showing up:

https://developer.apple.com/library/mac/documentation/IDEs/Conceptual/AppDistrib utionGuide/AddingCapabilities/AddingCapa…