[NTG-context] headings in line numbering

Dear list, I have the following sample: \setuppapersize[A6] \definelinenote[otherlinenote] \setupnote[otherlinenote] [compress=yes] \startsetups[line:notes] \setupinterlinespace[line=2.9ex] \stopsetups \setupnote[linenote] [paragraph=yes, compress=yes, compressmethod=separator]% \setupnotation[linenote][alternative=serried, width=broad] \starttext \startlinenumbering \dorecurse{3}{\subject{Heading\linenote{title}} \dorecurse{2}{text\linenote{some text}\linenote{another text}\par}} \stoplinenumbering \stoptext How can I get headings added to the line numbers? Many thanks for your help, Pablo