Adding hidden field information in form redirect url

Hello everyone. 

I'm wondering if there is any way to pass information beetween some forms in the post submit redirect. My client was using some Jquery to modify the 'data-success-redirect' attribute of the form listening  the submit button click to add some information for hidden fields that have in the second form , but this is not longer working since the update to the forms made in May 2023. Does SquareSpace have an alternative to manage this?

Here is an example of what we want to do:

Redirect URL configured in post -submit redirect:   '/second-form'

Redirect URL modified before when the user fill al the information and click submit : '/second-form?SQF_EMAIL=test@gmail.com'

Note: The 'test@gmail.com' is the email digited by the user.

At the moment I'm not allowed to share the site url