Objective: Sync Customer Contacts from Zoho Desk to Mailchimp and bringing across several custom fields in the Contacts and map these to fields in Mailchimp

I can see https://marketplace.zoho.com/app/desk/mailchimp-for-zoho-desk but it doesn't say the extension is available in my region.

Does anyone have a custom function they can share that provides this function that I can trigger in a Workflow?