[NTG-context] spacing between chapters in TOC

Hi list, I want my table of contents to look like: Chapter             1     section           5     section          10     section          15 In other words with section items indented. I presumed I would need to do something with \setuplist[section]. I know how to control interline distance, whitespace, but in this instance, not indentation of certain lines in a toc. I tried \setuplist[section][indenting=yes] and even indentation=yes in the hope that existed. It doesn't, at least not used this way. But it must be simple enough to achieve? Julian