Update Mailchimp Subscriber Fields

Hey everyone… I’m trying to use actievepieces to add/update subscribers information in mailchimp but activepieces only allows me to update these fields: Email, First name, Last name, Language…

I have other fields in mailchimp I need to store (I.E. “Role”), and I have no clue how I should update them.
I see them in a JSON response like merge fields, like

merge_fields:{
FNAME: ""
LNAME: ""
CNAME: ""
JTITLE: ""
...

Any ideas?