Pull external info into a collection to cms

General problem: So I want to display a external info into a collection for cms, how do I do that?

My concrete problem: I have a newsletter form that connects to mailchimp and I want to put the mailchimp data in my netlify cms.

My ideia: When user click in submit button it goes to netlify func where I manipule that data, send info to mailchimp and then create a file(of format of my collection). Now I stuck here, can I send directly the file to my folder where I have my collections? Or should I use some api to send the file? This second option it will have some implications if there are a lot of people submitting, it will build the project many times…

EDIT: I don’t want to use netlify form

Any thoughts?

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