Pie chart layout layout.PieChart. Available in the layout storage by the key 'default#pieChart'.
The layout can be used as a tool for visualizing any data, or in combination with
other visual API components such as placemarks, the clusterer, and the objects manager.
The layout can be based on statistical data that should be an array of JSON objects with the "weight" and "color" fields
or a function that returns this array (see the "Placemark" example).
If "properties.data" is missing, the layout traverses all geo objects, determines the value of the "iconColor" option for each object, and
generates a diagram based on this data.