https://www.theverge.com/2018/2/27/17055608/onecast-xbox-one-game-streaming-mac-os-app

Windows 10 users have been able to stream Xbox One games to their computers since 2015, but Mac owners have been sadly left out of the fun unless they go through extensive workarounds with apps like Parallels or install a Windows partition on Boot Camp. Now, a new app called OneCast claims to solve that issue and enable Mac users to stream games from their Xbox One just like their Windows 10 counterparts, via 9to5Mac.

I briefly tried out OneCast, and it works like it says on the box. I have no idea how it’s managing to work, but it seems to be using the same built-in streaming system that Microsoft users have for the official Xbox streaming on PC. Setup was as simple as installing a driver for the Xbox One controller and logging in with my Microsoft account, and I was up and running with a game of Battlefront II.