Unique identifier for the layer/trace
OptionalintersectionsArray of audio states for all lines that intersect at the current point. Used for intersection-aware audio playback in multiline plots. null/undefined for normal points (single line or no intersection).
OptionalgroupNumber of groups/series in the plot. Only present for multiline plots where plotType === 'multiline'.
OptionalgroupLabel and name of the group/series the cursor is currently on, e.g.
{ label: 'Group', value: 'Series 1' }. Only present for multiline
plots (plotType === 'multiline') whose data names its groups; absent
when the spec authors no names, so consumers can omit group wording
rather than announce a positional placeholder.
OptionalorientationPlot orientation, if applicable (e.g. bar, box, violin).
Extended trace state for layer switching mode with navigation indices.