Add class UID to <a> tag wrapping username in chatboxcontent

In the main chatpanel the usernames are wrapped with <a class="UID" id="drupalchat_user_UID"> tag.

I would like the same for the usernames in chatboxcontent in user chats and public chat room.
In that way we would be able to highlight certain users by css (i.e. different colors or background-images).