Change the default text on the Invite's Subject Line

The current default on any new invite is “My Name + the Full Name of the person booking the invite”. For example, some books a new appointment and they get an invite that has “My Name and Their Name”. I end up having to fix the Subject Line so it is more specific to the meeting. For example, I would change it to: “Google Meet: My Company Name + Their Name”. How can I change the default subject line and add a personalization field (i.e. “Their Name” which is what they entered in the form field when they booked the appointment).