seriesColor property
Color which represents the entire series in legends.
If this is not provided in the original series object, it will be inferred from the color of the first datum in the series.
If this is provided, but no colorFn is provided, then it will be treated as the color for each datum in the series.
If neither are provided, then the chart will insert colors for each series on the chart using a mapping function.
Implementation
@override
Color? seriesColor;