You can find instructions here to access the settings for the Need4Viz charts : Format Custom Element.
For the Google Pie chart, the available settings are :
Global
Extended parameters
Global
Title of the chart : this common setting is described here →
Title of chart
Legend : define the format of the legend and the position to display it.
Chart type : define the shape of the chart (pie, 3D pie or donut)
Chart rotation : define the rotation of the pie
Sectors labels : define the format of the labels and the content you want to display (none, value, percentage or label).
Slices
Min threshold of a sector : define here the minimum threshold (in percent) to display the slice (all slices under this threshold will be grouped)
Progressive separation thresholds : you can define 4 different levels of sectors separations identifying each by a min and max threshold
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Export HTML : this common setting is described here →
Export HTML