Mailchimp Integration with existing Audience list.

Hi there,

My client wants to use an opt-in subscribe form on her new website. She uses Mailchimp free version and has already an existing audience but these contacts were added manually in mailchimp. I read that you should only use empty mailchimp audience to connect your storage to squarespace. Does this also apply for an existing audience without having a subscribe/newsletter block?

I really appreciate your help on this!

best,

Hanita