[jitsi-dev] [jitsi-meet] Webinar effect tuning advice?

Hello, expert:
For multiple part conference perspective, I feel that jitsi-meet is perfect. If I want to use jitsi-meet to support webinar when no more than three participants need to upload high quality video, while much more more participants can join without camera. A better solution will be that audience can raise hand and ask for upload his personal video, although this is very optional.
Any advice on tuning jitsi-meet for such requirement?

Thanks and Best RegardsYanchong