Thanks Makulik for the tip.
This is the shape that I created in case it is of use to someone:
shape main
{
// bottom ellipse
ellipse(0,50,100,110);
// middle shape
startpath();
moveto(0,25);
lineto(0,82);
lineto(100,82);
lineto(100,25);
endpath();
fillpath();
moveto(0,32);
lineto(0,82);
moveto(100,35);
lineto(100,82);
// top ellipse
ellipse(0,0,100,60);
}
I still find it frustrating that EA does not provide it out of the box, and that it does not support image transparency.