Dear Fabrice,
A try and error method which you may not want:
% macros=mkvi
\setuppapersize[A4][A4]
\setupcolors[state=start,cmyk=yes,mpcmyk=yes]
\definecolor[mycolor][c=0.45,m=0.00,y=0.1,k=0.00]
\definecolor[colortext][c=1,m=0.00,y=0.3,k=0.3]
\starttext
\startuniqueMPgraphic{funny}
path p ;
numeric h ;
h := OverlayHeight ;
p:=unitsquare xscaled \overlaywidth yscaled \overlayheight superellipsed
0.9 ;
pickup pencircle scaled \overlaylinewidth ;
fill p withcolor \MPcolor{\overlaycolor} ;
draw (20,1)--(20,h-1) withcolor red ;
draw p withcolor \MPcolor{\overlaylinecolor} ;
\stopuniqueMPgraphic
\defineoverlay[funny][\uniqueMPgraphic{funny}]
\define[2]\MySectionCommand
{\framed
[background=funny,
frame=off,
width=0.5\textwidth,
align={right},
framecolor=mycolor,
rulethickness=1.5pt,
backgroundcolor=white,
offset=4pt]
{\tfb #1\space\colortext#2}}
\setuphead[section][command=\MySectionCommand,ownnumber=yes,numbercolor=colortext]
\section{A}{PLAN DE L'ESPACE}
\stoptext
Best,
Akira
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