How to "Send with Zoho Sign" to a specific Contact Role

How to "Send with Zoho Sign" to a specific Contact Role

We use Contact Roles for Deals.

A Deal's main Contact might be different than a Customer's authorized contract signer/decision maker. I want to use Send with Zoho Sign and send only to a specific Contact Role.

If the Contact Role does not exist for a given Deal, the Send with Zoho Sign needs to gracefully abort.

Can this be done with Deluge code, or is there an easier way?

Thanks,

Ken