@Sabin George Thanks for your patience on this. I have checked with internal product team on this and sharing the below based on the response from them.
Currently sending raw audio with microphone audio using unity plugin is not supported and our engineering team is actively working on this but there is no ETA on this yet.
Your feedback is noted, and I have relayed the feedback internally to our product engineering team.
We also have a feedback item on this, if you wish you may upvote on the Uservoice post - All of the feedback, you share in these forums will be monitored and reviewed by the Microsoft engineering teams responsible for building.
Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community looking for help on similar topics.