[NTG-context] Table of Contents Header?

I am playing around with imitating the design of fiction books from the early 20th century. The table of contents for these books often has small headings, 'CHAPTER' (or 'CHAP.') and 'PAGE' over the respective columns. How might this best be accomplished in ConTeXt? Just add a carefully formatted line before the \placecontent ? Or is there some more foolproof way of getting those headers into the right place?