Cakephp - Add new field CC email with multiple recipients

We would like to add a new feature to our online proofing application. In the application we can create user account with some specific info (name, business name, phone, email, username, password) Cakephp use the field email to send a notification each time there's a new comment or new image uploaded into the client profile. We would like to add another field for the CC (CakeEmail::cc()) and have the possibility to add many email separated with comma or semicolon in the same field. email1;email2;email3