Adding list-unsubscribe header with sendEmail API of Simple Email Service (SES)

I am trying to add a list-unsubscribe header to the email which I am sending out with SES API. It is very common to do so for bulk email such as news letter but I cannot find the way how to do with the sendEmail API. I could use sendRawEmail but it would be much easier to use sendEmail. Can anybody suggest the best way to implement the list-unsubscribe header? Yasu