Setting participant volume

I’m a React, and WebRTC noob, attempting to build and iOS (and android app eventually). One of the features that is key to my app is the ability to control another participants volume. I should mention that I’m using the Jisti SDK, and apparently WebRtc. I noticed that for whatever reason, the Jisti web client has that feature exposed, however, the same is not true for the iOS, and perhaps the android, SDKs. Would I need to make any changes to WebRTC to enable this feature?