Have a related question to this , how to reference these merge fields in the template pdf? Can you share the syntax for above example in document.

I have an envelope with 2 recipients and 5 documents. I’am using Docusign’s Apex Toolkit to send the envelope for signatures. Recently I got a requirement to enforce signer visibility to show a set of documents in the envelope to Signer 1 and a set of documents in the envelope to Signer 2.
I was able to achieve this with DocusignAPI’s ‘enforceSignerVisibility’ property.
I want to accomplish the same using Apex Toolkit (We HAVE to use the apex toolkit because we are automating the envelope send).
Any help as to how to achieve this with Apex Toolkit will be a massive help