ghPython : create Scribble on the canvas and set its position

I would like to create scribbles at specific locations on the canvas; relative to the bounds of a group.
MetaHopper does this, but I’d like to do it in a ghPython component. I cannot find the attributes, like Pivot, for Special.GH_Scribble that would set its position.

Where should I look for help on this?

Thank you,