Print Dynamic Contact Field value in an Email BFS Url

Hi,

I would like to store/print the [current] value of a contact field in a blind form submit URL upon sending an email that stores that email. The same way how you would add a field merge to write the data from a contact field in an email as plain text.

A field merge as a parameter in the URL does not meet expectation, because the value in the contact field changes after 7 days, which would make the email parsing wrong data upon submission of the blind form.

Any thoughts?