How to detect if a player's device supports portrait screen orientation?

I’d like to show a splash screen to players showing them that our experience can be played in both landscape and portrait modes but I’m having a hard time finding a way to determine if the current device supports it. To clarify, we already have support for portrait and make use of PlayerGui.ScreenOrientation and PlayerGui.CurrentScreenOrientation; this is specifically about detecting support so that we are only showing instructions that apply to the player.

Ideally I’d like to be able to check very specifically for screen orientation similar to UIS properties like AccelerometerEnabled, TouchEnabled and others however AFAIK this is not something we have access to.