It appears Document Builder is limited with PDF's and DocuSign only.
It would be beneficial to map fields with .docx files and reduce the need for using excel for this purpose. My company has a specific need for .docx files to be auto generated. We have hundreds of docx. files that don't necessary require signatures, but key dates, and names from Columns. Unfortunately we have to double our efforts using Smartsheet and Excel to accomplish this currently.
https://www.linkedin.com/in/zchrispalmer/