Type Alias ChartLegendEntryRef

ChartLegendEntryRef:
    | { series: string }
    | { point: integer; series: string }
    | { series: string; trendline: integer }

Identifies one legend entry by what it shows.

Form	Entry
`{ series }`	A series.
`{ series, point }`	A point of a series, in a legend that lists points, such as a pie's.
`{ series, trendline }`	A series' trendline, by its index in `trendlines`.

series is a series' id, and point a zero-based point index.