Xbox Cloud Gaming with KBM

I am currently trying to play fortnite via xbox cloud gaming with my keyboard and mouse (mac) and there is no option to connect it, i tried googling it but it was all stuff for windows pcs, but i dont own one. The only thing i can do with the keyboard and mouse is the buttons that come directly from the xbox cloud gaming website, but not the game itself. I can use a controller but the only wireless one i have has awful stick drift and its pretty much unusable.