code: def _image_bbox(width, height):
      return dict(
          xmin=-0.5,
          ymin=-0.5,
          xmax=width - 1 + 0.5,
          ymax=height - 1 + 0.5,
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: _image_bbox(width, height) and returns: dict