That thing usually goes by the name "wake lock". I can't imagine why it's not doing the right thing by default.
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I use qtile on X11 and hyprland on Wayland. There is an option on hyprland for exactly that (idleinhibit window rule), but didn't find a good solution on qtile yet. Anyway I have issues with qtile for other things too (because of X11 mainly).
Try putting the browser on fullscreen, see if that keeps the screen alive while playing.