I'd recommend seeing what the community has shared, others may have uploaded their games/settings for that phone on EmuReady. The sites is maintained purely to share exactly that.
https://www.emuready.com/listings?deviceIds=%5B%22b600b2d5-3631-4f50-b235-a9d0d2559445%22%5D
(here is the results filtered just by your handset, but these include all kinds of emulation, not just GameNative)
But by the same token, 99% of games which do (and don't) run won't have been shared there either. So it is a game-by-game basis.
A good one to start with would be a 'light' title like DREDGE, if you own it?
I'll do a little checking and see what I can find on your phone though, will come back and edit with what I find soon!
Edit: Here is a post on Reddit where the OP asks the community how the Pixel 8 is for emulation in general. The top comment says that they're using Winlator and have 60FPS/720p performance for BioShock, New Vegas, Wow with dx9/10 games. So these should translate to being the same performance/playability on GameNative (I'd hazard, anyway)
There's also results in the GameNative Discord, but too many to share here. I do hope this helps, though!