Setting to hide name/picture from everyone.

I am wanting to know if there is a setting a host can set to allow someone to participate in the meeting, but not show up on gallery view or participant list?  When I help another presenter or in a meeting but I am just there to moderate or troubleshoot issues so the presenter can concentrate on the information, I'd like to not be listed as a participant and  more importantly I don't want to appear in the video gallery. I know I can turn my video off or just show my profile picture, but when I am just assisting in the background, I'd rather be invisible at least on the video gallery.  We require participants to have their video on during most all of our meetings/trainings and I don't feel right about having my camera off and using my profile picture when others can't or shouldn't.