I use Sound Assistant from the Samsung store. It has an option called “multi sound” that can be toggled. It looks like the app now has an option to enable multi sound for all apps (or just for a single app, but it only gives the option for none, one app, or all apps); though I think that must be new because I’m pretty sure it didn’t have that option the last time I checked it.

Dunno if there are any system-agnostic options.