We have a template message that we send to guests to confirm changes they make to their booking. The template message field codes offer these great "previous" options so we can easily show a crossed-out version of the previous date or check-in time, for instance, contrasted with their new date or check-in time. You can see our use-case in below.
However, there are no "previous" field codes for the previous number of guests or pets. Making those options available would be consistent with what you already offer and make it possible for us to more readily highlight guest/pet count changes in our email messages to guests.
Please add field code options for: