[NTG-context] specify column-width, with option=stretch

Hi, I would like to specify the column-width of the first column to 5mm: --8<---------------cut here---------------start------------->8--- \starttext \setupTABLE[textwidth=99mm, option=stretch] \setupTABLE[c][each][align={lohi, middle}] \setupTABLE[c][1][height=5mm, style=\tfxx] \framed[width=5mm, offset=0pt]{5} \bTABLE \bTR \bTD[nr=2] \setupinterlinespace[1.8ex] 1\\2\\3 \eTD \bTD bla \eTD \bTD blablabla \eTD \eTR \bTR \bTD[nc=2] blabla \eTD \eTR \eTABLE\par \framed[width=99mm, offset=0pt]{99} \stoptext --8<---------------cut here---------------end--------------->8--- How could I do that please? TIA for any hints, -- Peter