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Sheets.Charts.IChartLegendLayout
• Optional height: number
The height of the chart legend, it's percentage, and it's based on the chart's height.
• Optional width: number
The width of the chart legend, it's percentage, and it's based on the chart's width.
• Optional x: number
The x position of the chart legend, it's percentage, and the base line is chart's left edge.
• Optional y: number
The y position of the chart legend, it's percentage, and the base line is chart's top edge.