labelDefinitions

The collection of LabelDefinition objects that define label display for the summarized attribute values of aggregated geoelements. Label expressions can only refer to the fields defined in AggregationFeatureReduction.aggregateFields. Feature layer fields are not accessible to aggregated geoelements. AggregationFeatureReduction.labelDefinitions is independent of FeatureLayer.labelDefinitions and GraphicsOverlay.labelDefinitions. Labels on aggregated geoelements will only appear if there is at least one LabelDefinition defined.