Ship a variable #{ticket.group.email} out-of-the-box, containing the actual email address selected via email_address_id

As talked about in this thread (#{ticket.group.email} variable not working in signatures), I would appreciate having an object/variable for groups out of the box that dynamically contains the “clear-text” mail address (mail@example.org) of a certain group, e.g. to use in signatures.

At the moment, we only have the ticket.group.email_address_id object, but that contains an integer value of the mail address object from the Email / MS365 channel, not the actual mail address itself.

Also, a headsup that there is currently a bug with ticket creation and signatures containing variables that would also affect this FR (more info here [#{ticket.group.email} variable not working in signatures] and here [#{ticket.group.name} variable not working in signature when creating a new ticket]).