[NTG-context] Hook environment into head/structure setup

Hi all, I don't think it is yet possible, but it would be nice if there was something like: \setuphead % or perhaps \setupstructure [chapter] [beforestructure=\startlinenumbering, afterstructure=\stoplinenumbering] Which should result in: \startlinenumbering \startchapter[title=test] Text \stopchapter \stoplinenumbering Is there already a way to achieve this? I've consequently used \start-\stopchapter, maybe one can append \start-\stoplinenumbering to them? I would appreciate any help Andreas