Adding Variable for Communication Plan Emails

When sending an email in a communication template that goes to someone else to complete a task, I need the body of the email to contain the name of the person the communication plan has been attached to. The only available fields are recipient and sender names. Hope that makes sense. Basically Person A (sender/me) sends an automated email in a communication plan to Person B (recipient) that includes the name of Person C (to whom the communication plan is attached), so I guess this is another variable option like "Student_Name".