Type Alias SplitType

SplitType:
    | "splitByPosition"
    | "splitByValue"
    | "splitByPercentValue"
    | "splitByCustomSplit"

How a pie of pie or bar of pie chooses the points of its second plot: the last so many, those below a value or a percentage of the total, or those chosen by hand (Office Scripts' ChartSplitType).