How to show value in chart?

Put this in configureChart

from java.text import NumberFormat
from org.jfree.chart.labels import StandardCategoryItemLabelGenerator

plot = chart.getPlot()
renderer = plot.getRenderer()
renderer.setBaseItemLabelGenerator(StandardCategoryItemLabelGenerator("{2}", NumberFormat.getNumberInstance()))
renderer.setBaseItemLabelsVisible(True)
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