Check out Romm. Not every romm can be streamed but think it meets your needs.
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I can second romm. it has EmulatorJS built in which will run most games in the web interface. there's also an android app (maybe iOS too can't remember) and they have apps for a few different handheld emulators. I have their app installed on MuOS on my RG35XXH and I can view my "cloud based" ROM library and download them straight to the anbernic's local library.
I haven't set either up yet, but my leaning is more towards gaseous-project due to not having to sign up for an IGDB account.
Gameyfin might be close to what you are looking for, my friends and I use it for our DRM free games.
Does this work with both retro games (ROMs) in addition to modern games?
Its much closer to a Dropbox/google cloud folder with game installers in it than it is to some of the other suggestions.
Like Steam or Epic or GOG, you click download, and it downloads the game files and installer, which you can then use to play the game.
So in the case of ROMs you would be better off with the other options, as this would just download the ROM file, and you would then have to figure out your own emulation situation from there.