[NTG-context] stoppers in section heading without having stoppers in references?

In MkIV, is there a way to get a stopper (e.g. ".") in the section heading, along the lines of "1. First heading" but without a reference to it having the stopper? Thus, the reference should be just "In Chapter 1 we learn", not "In Chapter 1. we learn"? I have tried many variants of the following minimal example: \setuphead[chapter][sectionstopper=.] \definereferenceformat [inchapter] [text={Chapter~}] \starttext \chapter[one]{First heading} \input knuth \inchapter[one] we learn. \stoptext -Sanjoy