I had the same requirement but found no solution. Finally I ended by saving those extra fields in my database. Try luck by opening a case to Jive.
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One option would be to have a standard format for the "Lead Text" at the beginning of the Document, then use the API to retrieve the body (content) of the Document and use some script / regex to parse out the lead text.
What about the copy functionality? You can use a document as template and provide the link to your users... When a user clicks on the link, the body is filled with the text of the template document...