How to move emails from one AWS WorkMail user account to another

We have different email domains in our AWS WorkMail organization. This domains have common user names, as separate inboxes. Example:

• anne@company_a.com
• anne@company_b.com
• ...

We would like to have them merged, into one single user (company_a) and add the rest of the email addresses as alias. But for that, first we need to migrate (move) the emails from one inbox to the other.

Is there a way to do this from the AWS Console or programatically?