Discord cant stream desktop audio at all on Linux aside from sharing a tab’s audio if you’re using Discord in a web browser. There are custom clients (like discord-screenaudio which OP mentioned) capable of doing this to some extent but they’re based on the web version of discord and lack features / can be buggy. Also these options don’t have hardware encoding so any fast moving content will become a choppy mess for the viewers.

The other alternative on Linux is to just route the app’s audio into your mic source. Others will hear it but it will come out as if its your mic so even those not watching the stream will have to hear the stream audio unless they mute you.

Even when you’re not intentionally plagiarizing, Turnitin may catch something that could screw you over when the assignment is submitted. Sometimes you have a chance to see what Turnitin analyzes and resubmit the assignment but OP is saying they can only submit it once so they want to use the Grammarly checker first.