An array of nested group objects.
The id of the group. Defaults to the name if not specified. This is also used to specify the date for non mixed frequency time axes. The specified date for non mixed frequency time axes must be an ISO string.
The CSS style object defining the style of the group label text. See the Help documentation for more information.
The name of the group.
The description of the group. This is used for customizing the tooltip text and only applies to a categorical axis.
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Whether drilling is enabled on the group label. See the Help documentation for more information.