Does Appian Have a Way to Create a JWS (JSON Web Signature) for POST Body?

I am sending a POST request via an integration, and this endpoint requires that a JWS (signature of the body) is sent in a header. This is similar to a JWT, except that what is signed is the body of the POST rather than the claims included in the token. In our instance, I see the plugin functions for creating JWTs, but none of them seem to have the ability to create a JWS.

Any ideas on this one or will I have to create my own function plugin?

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