Pages.app get address link via applescript/Xcode?

I can’t control what I’ll call a particular link (Sender: City; labeld as “Anytown”) in any given template.
How do I get an Address book field in Pages by “type” (Name) and “field” (First)?

Incidently, “Sender: City” is the Yellow label that pops up when the cursor is placed over the link.

Thanks.