Use Variables In Email Subject

Would be ideal to utilize variables in email subjects for notifications to customers and team members. Customers may book several appointments at once. Currently, the email subjects are identical, so the recipients can't tell which email relates to which appointment without opening the email. It would be useful to add variables to the subject for easy identification. An ideal subject for a customer may be: Appointment Weight Training Aug 1 3:00pm with Coach Adam And an ideal subject for a team member may be: Weight Training Aug 1 3:00pm - Jane Doe In both cases, the event name, date, start time, and names are variables. This would be a great help for customers and team members.