From a template in word you can add the values received from a microsoft form and create a document
This new Word Online connector that was shipped last week should help accomplish your scenario.
Check out this blog to learn more:https://flow.microsoft.com/en-us/blog/generate-word-documents-in-your-flows/
On a similar line of thinking, a more streamlined mechanism to scrape the content of a Word document, and to append another document with that text is something I've had requested from functional users on a few occassions.
This feels like something that MS would have on a list of low-hanging fruit.
You forgot to mention that the word online connector is premium and has an extra cost attached.