Which web page was my Dynamics 365 Marketing form submitted from?

How to use the same dynamics 365 marketing embedded form on multiple pages in your website, and being able to know which web page the form was submitted from. For example you have a general enquiry form which is a request for more details, you embed this on multiple pages about various services you offer. It is valuable to know which service the enquiry is about, without relying on the customers message to tell you or having to create different forms for each page with a hidden field set to a default value.