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Send collection item details in form in category page

Hey folks!

Could use some help here:
I have a category page with a collection list displaying several of its items. Each one of the items has a button which opens a modal with a contact form. I would like to receive in the form submitions the information of the item the user send it from.

Any idea how to do it? Maybe with a hidden field, but I guess there is no way around JS? How would you do it?