JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Unfortunately we currently do not have a feature that would fit your requirement. It is not possible to fill out an existing document from your google drive with data gathered from the form. However, you can still integrate the form with google spreadsheet and then save that sheet as a google doc instead.
Hope this helps. Please let us know if you need further assistance.