OptionallabelLabel mode (default: 'percent' for inner rings, the chart labels for the outermost)
OptionalmaxDefault: the chart maxSlices
OptionalnameRing name (tooltip, data table)
Optionalradius[inner, outer] radius as fractions of the full radius (0 <= inner < outer <= 1). Default:
ring k of n takes the k-th equal share of the band from donut to the rim, with a small
gap between neighbours
OptionalsortDefault: the chart sort
One ring of a multi-ring pie (ECharts "nested pies"). Rings are drawn inside out in the given order; slices with the same name share a color, a legend entry and the legend emphasis.