Is there a way to automatically add Secondary Contacts (CCs) when creating a new ticket for specific customers?

Is there a way to automatically add Secondary Contacts (CCs) when creating a new ticket for specific customers?

Some of our customers want multiple contacts to receive all notifications from our support team. Is there a way to automatically add secondary contacts to a ticket when our support team opens a new ticket and associates it with an account? This would ensure all relevant contacts are included in the correspondence without requiring individual support team members to manually track and add them each time. 

We have "Allow CCs on tickets" enabled, but don't see the Secondary Contacts field as one of the fields we can update automatically using Workflow rules.