Embedding a signature in an e-mail trigger?

I'm trying to replicate a paper form that requires a signature, and then e-mail a printable copy of this form to the respondent and the administrative personnel responsible for processing the form.
I am using the Signature Question field but don't know how to embed its answer as with other survey questions or embedded data.
How do I embed the response to a Signature Question in an e-mail trigger? I already tried checking "Include response report" and "Show full question text" but neither of those include the signature.