Create fields in PowerPoint templates that then are recognised by Adobe Sign when PDFs are produced

We've recently discovered Adobe Sign - so we can now send the documents using that for the clients to sign electronically.

One thing I was wondering is whether the client name, position, date and signature boxes, which they would complete using Adobe Sign, can be embedded into the PowerPoint template somehow - so that when the PowerPoint template is edited for each proposal and then saved and converted to PDF - the resulting document would already have the relevant form fields in there for Adobe Sign to pick up - to save the users having to add those fields manually onto the PDF within Adobe Sign.

I gather within Adobe's Workflow Automation you could kind of do some of this - but as far as I can tell it wouldn't work if the document wasn't a template saved within the Doc Library - in our case the PowerPoint has already been edited with various project-specific slides etc - so it would no longer be a template once converted to PDF and getting signature.

Hope that's at least remotely clear!?