Your comment surprised me given GTA V can run on Intel HD 4000 at 40fps with tweaked settings https://www.youtube.com/watch?v=fo2qGdXnabk Which is not so surprising given GTA V is over a decade old at this point.
https://steamcommunity.com/profiles/76561199644291769/recomm...
I own a steam deck. I played it until it stopped working.
It is now, as of today, listed as unsupported.
If it wasn't I'd be playing it now instead of convincing you of a simple fact.