AMP Email- Permitting Signature Pad in Form

### Description

Many of the nonprofits we work with have expressed how critical it is from a human centred design perspective to be able to permit email recipients to sign a petition directly from the email because of the high drop-off rate when clicks to a website or form are required. Many legal petitions require drawing out a signature, even if digital, but just clicking a button isn't considered valid.

We've been looking at leveraging AMP forms, but it would be amazing if we could securely implement a drawpad like component, whether an AMP made one, or a prebuilt one like https://github.com/szimek/signature_pad/blob/master/docs/js/app.js

### Alternatives Considered

We've considered stylized forms, but unfortunately the signature component is a critical feature, and file uploads of drawn signatures do not seem to be a solution

### Additional Context

_No response_