Position of the legend.
Default value
Automatic.
Valid values
Can be one of the following:
'bottom' - Displays the legend below the chart. 'labeled' - Draws lines connecting slices to their data values.
'left' - Displays the legend left of the chart.
'none' - Displays no legend.
'right' - Displays the legend right of the chart. 'top' - Displays the legend above the chart.
