[NTG-context] Numbered bookmarks in PDF

I am struggling a bit with numbered bookmarks in generated PDF files. In LaTex, the HyperRef package supports the option "bookmarksnumbered = true" which adds the chapter numbers to the bookmark list. Does anybody know of a similar option in ConText? I have searched the \setupinteraction documentation, but haven't been able to locate anything useful. I have also tried the \bookmark command with reference to \headnumber, but macro expansion does not take place. All hints are welcome! Best regards, Tommy Jensen