How do you change the sound shared while sharing screen?

I like to watch movies with my friends, and also play some single-player games while others in my Discord server watch it, and comment about it. Problem is, most people tell me they barely hear what I'm sharing. Even when I increase the volume of my system (To a point even I hear too loud), they can't barely hear anything (They have the volume of my streaming at 100%!).

Does anyone now if there is anyway I can increase the volume of my shared screen??