[NTG-context] Framed: Individual background offsets

Hi, how can I set individual offsets for the background, similar to loffset, roffset, etc.? \defineframedtext [foo] [frame=off, offset=none, backgroundoffset=1cm, %% backgroundloffset=1cm, %% there is no backgroundloffset background=screen] \starttext %% backgroundoffset is applied on all four sides \startfoo \input ward \stopfoo \input knuth %% this is what I'm aiming for \startnarrower [-1cm] \startfoo [backgroundoffset=0cm, loffset=1cm] \input ward \stopfoo \stopnarrower \stoptext Marco