Zoom - customize waiting room

We have a quarterly zoom meeting with a core group of about 15 participants.  We dial, from inside the meeting, individuals to discuss company specific information.  Information exchange is confidential within the individual discussions.  

An individual is in the waiting room as we finish the discussion with the previous individual.  We would like the person in the waiting room to hear music and a message regarding their wait.  

I have figured out how to customize if users are waiting for the host to join the meeting.  This is the concept but a different application.