Find someone on social media with one connected to their PC and ask them to test a demo?
Create a copy of the default.gamepads found in the builtins folder and then define your new copy in the game.project. Try to create new mappings (edit the file directly in a text editor) for the name of the xbox one controller and see if it works if it just doesn’t by default. I’m not sure if it will work but would be interesting to see. I don’t have any other controller than 360 usb handy to test myself.
If adding more controller information to that file is all it takes to add more devices, then we (someone with time to do it) should find a good sample file with many good configs of various gamepads. I’ve seen them on github before with the license to use their data.