Help understanding auto-populate fields

I need some help figuring out how to auto-populate fields in our documents (i.e. fields that auto-fill upon signature). So, I've been able to add an auto-populating date field to one of our documents using this JSON: { "binding": "{approval.signed}", "validation": null, "id": "mKOpnLGSlY0Q", "page": 0, "height": 50, "subtype": "LABEL", "width": 200, "top": 250, "left": 175, "extract": false, "extractAnchor": null, "data": null, "value": "yyyy-MM-dd HH:mm:ss 'GMT'", "name": "", "type": "INPUT" } This all works just fine - as expected, I get an auto-populating date field. Presumably, this is because of what I've specified in the "value" field - eSignLive sees that this is a date format and knows I want a date field. But this is where my confusion comes in - we have a requirement to also auto-populate the signer's title (if available). When I reference this documentation - http://docs.esignlive.com/content/c_integrator_s_guide/sdk/e_preparing_documents/fields.htm - I see that "Signer's Title" is one of the available options, but I'm struggling to find any documentation that shows what I would need to alter in my above example JSON to switch this from a date field to a title field. Could someone please help point me in the right direction? Thanks, Nick