Email association label as a group

I would like to be able to type in an association label in an object’s email and have it populate everyone with that label on the to line. For example, I have a Deal with labels for “Hiring Manager.” There are several on a job. I would like to be able to click email and type hiring manager and have the three hiring managers be added to the to line for the email. This would be helpful for emails having larger numbers of contacts who need to be added to an email. Accounts payable would be another example.