How do I figure out what device features are available?

I have a Quest Pro application which I am trying to make compatible with other headsets such as the Quest 2. Part of my app integrates using the stylus as an input method but that obviously won't work with a Quest 2. I have a workaround to do the interaction without a stylus but I need to be able to detect this so that the user always uses the best available input method. How do I tell this? One way I can think of would be to somehow detect which headset is being used but that may not be an amazing idea for forwards compatibility and I also have no idea how to find this out in a Unity C# script?

Any help appreciated.