I'm sorry, but the addon doesn't have such a feature. This is out of the private comment login. It's designed to show the comments only for the comment owner and high-level users such as admins, moderators, etc. 

I may suggest you configure this using wpDiscuz's built-in "Hide comment section for roles" features. It's located in the Dashboard > wpDiscuz > Forms admin page, just edit the form to see it. 

I am using the private comment addon. If I understand well, and based on my investigations, "private comment" is related to a single user with a specific role.

On our website, we have groups of users, which have the same user role (but different login information). So we would like, that users with the same user role can see the private comments of other users belonging to the same user group. Is that possible in a way? Actually, users can see only their own private comments and not those of other users with the same user role.

Kind regards and many thanks in advance for your support

Franz