This page shows the various options for in-graph labels. The in-graph labels can be set like this:
obj.Set('chart.labels.ingraph', [,,'Hoolio',,'Olga']);
Or like this if you want to be more specific:
obj.Set('chart.labels.ingraph', [,,['Hoolio', 'red', 'yellow', -1, 60],,'Olga']);
The array can consist of:
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