I'm playing on ROG Ally X from yesterday and ....

Hello,
I've been playing since yesterday and I'm enjoying it (as a fan of the Diablo genre), it works quite well on Rog Ally X connected to my 4K monitor (I play at 1080p), but I notice that I can only play it externally with an Xbox controller because the handheld controls are not recognised. Why is that? Will this be implemented in the future? Because this means you can't really play it on the go. Thanks.