Limit access to chat funcionality

Hello,

I would like to know if there is a way to limit to a user or a group of user an access to the teamviewer chat.

We are using another solution to chat between ourselves and we would like to avoid some users using Teamviewer to chat with their colleagues. Is it something possible ?

As well is it possible to chat with another technician invited to a session trough the session's chat without having the customer know about it. Case would be Tech A get connected to Customer x 's computer and share the sessions to Tech B. Tech B and Tech A would like to communicate through the chat of the session without having customer x seeing their discussion. Does someone know how to do that ?