Include header in a form submission from an exported webflow site

Is it possible to include a header in a form submission from an exported webflow site?

Normally the form submission is sent directly as a POST Request. Thinking of catching the data somewhere in the backend first, adding a header to it and reformatting the JSON. Afterwards sending it to an API Endpoint.

The auth key can of course not be public, is there a way to do this securely? Anyone interested in helping out with this project?


Here is my site Read-Only: LINK
(how to share your site Read-Only link)