Signatures in Indy and JWS's in RFC 0017 - work together?

We want to create an RFC to sign attachments using RFC 0017 (attachments decorator), which calls for the use of JWS's. We want to then use that protocol to allow a Sovrin Txn Author to send an Indy ledger transaction to a Sovrin Endorser to sign. Can the use of JWS in RFC 0017 support that use case, or does there have to be Indy-specific/non-JWS handling done to get the correct signature? @kdenhartog @TelegramSam @dhh1128 do you know?

We're assuming that after we get the signature and DID (kid from the JWS), we'd have to add to the non-signed part of the transaction and that's OK. It's just the use of JWS in general that we're not sure of.