[NTG-context] is it possible to have first and last line numbers from page?

I have asked this question before (more than twice), after I found no answer in the ConTeXt reference manual, the wiki or the mailing list. I wanted to be able to have in the headers the first and last line number from page. This feature is extremely useful when typesetting some kinds of poetry. The most basic sample would be: \starttext \startlinenumbering \dorecurse{10}{\input zapf\par\input knuth} \stoplinenumbering \stoptext Is that possible to achieve with ConTeXt? Many thanks for your help, Pablo -- http://www.ousia.tk