Wordpress Groups and Mailchimp Sync


I need a way to sync some of the groups ive made (through the wordpress groups plugin) with mail chimp.

I currently use woochimp to add all of my users to mailchimp and users you have bought specific items, go into a mailchimp group. But only new transactions/users are going into this group. I need a way to sync all users that are currently in a wordpress group (called bff customers), to the corresponding mailchimp group (bff members)

Is there any way to do that?