It sure is! The aperture  property of the scaleR  object reduces the size of the pie chart by the specified number amount.

scaleR: {
  aperture:180
},

The refAngle  property of the plot  object will flip the graph 180 degrees because the aperture will appear to cut the graph in a top down fashion.

plot: {
  refAngle: 180,
  ...
}

Example: https://demos.zingchart.com/view/ZXH1LAPL

Documentation

scale-r JSON pages
plot JSON pages

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