Using Adobe Reader Fill & Sign on unstructured documents

So I have been researching and a current idea on a project has been majorily eluding me on how exactly I can accomplish it. The issue is that the project is going to be taking unstructured documents that come in, they will be scanned into a digital format from the paper (or from fax or email) and then an electronic signature will need to be applied to them. However, everywhere I read I see things all about Adobe Sign but it appears to be taylored for structured documents where the signature field is always defined and placed.

This is why I am looking at the Fill & Sign feature inside of the Adobe Reader DC. It has the capability to sign a document, move that signature where it needs to be, resize it, and save the document. However, I can't seem to find the ability to use the Fill & Sign feature anywhere outside of the reader itself.

Am I missing something? Am I able to use the Fill & Sign feature outside of the Reader itself? Or is there another way?

Thanks.