[NTG-context] vertical justification of mixedcolumns

Hello list, in this MWE the columns are not aligned at the bottom, and they are not at the bottom of the page: \definevspacingamount[myBlank][5pt plus 5pt minus 2pt][5pt plus 5pt minus 2pt] \starttext \showgrid \startmixedcolumns[n=2,balance=yes] \dorecurse{2}{\input knuth \blank[myBlank]} Another paragraph to make columns uneven.\par\blank[myBlank] \dorecurse{3}{\input knuth \blank[myBlank]} \stopmixedcolumns \stoptext Is there a way to configure mixedcolumns so that \blank[myBlank] is stretched or shrinked to get the two columns end aligned at the bottom of the page? Thanks in advance, Massimiliano