If it's not a browser game is almost impossible to play it without downloading (there are streaming services, but I don't think they have a mobile game... They are usually console games that you can even play on mobile)

What you can do is use an emulator and download it there directly. I recommend Bluestacks and LDPlayer (Bluestacks has more requirements, comes with settings ready to play it without customizing, but in my opinion it plays bugeado, I tried fixes mentioned by Youtube and nothing...)

I still recommend you to play a native PC game, if you want it is for friends, well, you could opt for a game with crossplay.

without downloading it is impossible, lol

I don't understand your reasoning, Free Fire is a dedicated mobile game