Surely the simplest way would be to connect the documents to a data source containing all the required fields and, for each field, a record with whatever ouput text you want, then merge to a new document.
Still, if you're wedded to a VBA approach, you might find the macro titled
Create Text Representations of Working Fields in the
Mailmerge Tips & Tricks 'Sticky' thread at the top of the Mailmerge forum helpful. That code converts field codes to text representations of their content. See:
https://www.msofficeforums.com/mail-...ps-tricks.html
PS: For mailmerges, you should be using mailmerge main documents, not templates.