\startuseMPgraphic{outlineT}
draw outlinetext.b (\MPvar{tt})
(withcolor .75white)
(withcolor .725blue withpen pencircle scaled .75pt);%\MPvar{thick});
\stopuseMPgraphic
\definefont[BigFontOne][NotoSansCJKkr-Bold sa 4]
\define[1]\outlineTitle{\useMPgraphic{outlineT}{tt="#1"}}
\setuphead[chapter]
[textcommand=\outlineTitle,
style=\BigFontOne,
numbercommand=\outlineTitle,
% align = middle,
number=yes]
\setupexternalfigures[location={default,local,global}]
%\definefont[fancy][Zapfino at 24pt]
\starttext
\startchapter[title={Very Long Long Long Title}]
\startcombination[3*1]
{\externalfigure[cow] [combination]}{cow}
{\externalfigure[mill] [combination]}{mill}
{\externalfigure[hacker][combination]}{hacker}
\stopcombination
\stopchapter
\stoptext