For those of you who need to fill out forms in Word or PDF with mostly the same content but a few changing variable, take a look at https://html-online.com/editor/.
I just recreated my (simple) form in WYSIWYG and then copied the HTML code to Siri Shortcuts.
Paste the code into Text field and then change whatever variable you need to change in the code. You can use Ask For Input or Contacts or Menus or whatever you need.
Then generate the PDF from text and save it or email it. Cool website and workaround.