tbh if you’re on linux there’s kind of an easy workaround

pactl load-module module-combine-sink sink_name='Stream' slaves='easyeffects_sink'

^^ I have this aliased as “gamesound”

easyeffects is great for this because it’ll just be the default sink, plus easyeffects makes your mic sound good anyway. (if you configure it for that)

then when the game opens i set it to output to “stream” and bam i can output game audio in a stream without capturing anything else, since i’m on hyprland i can also stream just the window, discord screenshare with audio everywhere.