I use Steam ROM Manager to add my games to Steam and it works wonderfully.

I like this approach. I bought a gaming laptop after Stadia died because I wanted the powerful portability. What I found, however, was that it really wasn’t that portable. I ended up snagging the ROG Ally and been growing my Steam library and really enjoying the experience. I have 2 Xbox controllers and an Xbox wireless dongle that I used with my gaming laptop, and just tried the “docked” experience this morning playing Kingdom Hearts and it worked great. I’m a bit fan of this form factor.