Change all personal greeting message.
As you know some websites changing their domain always. And always personals must change site domain name from greeting message. You can add admin panel %greetdomain% and personal when add %greetdomain% their greeting message it will show from shortcode.
For ex: Photo
Are you talking about inserting domain as a variable in the greeting message on agent console preference? As you attached the post-chat screenshot, do you mean you want to have the feature so that when the admin updates the value on control panel, the greeting message in all agents sides will get updated?