Change user picture using a local repository instead of gravatar

I would like to use pictures from a local repository instead of Gravatar. I read some discussions about this in the wiki, but I could not find a solution. I am using authentication, so the identification of the user is possible.

This is not implemented at the moment in Jitsi Meet.

Also see this similar feature request :

Regarding use of Gravatar, please take note of this important change :