Set volume for the streamer separately from the viewers, per sound effect (re: jumpscares)


I've been reaching out to streamers regarding turning down the volume on their jumpscare notifications, as this is something the streamer opts into, but many viewers who are more sensitive to that sort of thing do not, but I realised this presents a bit of a technical issue, too.

How would a streamer go about setting the volume of their regular alerts to be audible at the same volume by themselves AND the streamer, but then have certain sound effects play at full volume for themselves, whilst quieter (or not at all) for the viewers?