SeriesStack

Specifies the configuration for Stacked series.

Name	Type	Default	Description
group?	string		Specifies the optional stack group name. Use this option for the Bar and Column series.
type?	"normal" | "100%"		Specifies the type of stack to plot. Use normal to sum up all the points within the category or group to determine the stack value. Use 100% to always set the stack value to 100% (1.00), with individual points represented as percentages within the category or group.