[NTG-context] Setting up header text

I’m trying to use \setupheadertexts to set up the headers to a specification. Is it possible to insert text between the various ‘chapter/section’ keys? What I want is something like this: | section “Chapter “ chapternumber “-” chapter | | “Chapter “ chapternumber “-” chapter section | where the “|” is a page edge, on a double-sided layout, and the “Chapter”s are literal strings, rather than the keys. I’m not clear from the command description whether this is possible. If not, might a clever macro do it? thanks