[NTG-context] image with rounded corners

Hi, can ConTeXt make rounded image corners? Both of my approaches don’t work: \externalfigure[mill][ width=3cm, frame=on, corner=round,radius=1cm, backgroundcorner=round,backgroundradius=1cm, ] \defineoverlay[Mill][{% \externalfigure[mill][width=\overlaywidth] }] \framed[background=Mill,width=3cm,height=4cm, corner=round,radius=1cm, backgroundcorner=round,backgroundradius=1cm, offset=overlay]{} Hraban