No problem! You’ll just want to replace the “value” with the appropriate contact merge fields, that way when the email is sent (or the link is clicked) the values populate with data from the Infusionsoft Contact Record, and prefill the appropriate Gravity Forms fields.
The link in the email can contain the contact’s id or email address. From that point forward, however, you’re outside of IS and retrieving the contact information will require the API. Other option is to send all the information you need in the url and make the parameter names identical to the id names of the elements to populate