Tip : Fusion Chart advanced Property in Jasper Reports - Bar chart title font size in Jasper Reports

Property : captionFontSize=10

JRXML expression : 

<fc:chartProperty name="captionFontSize">
	<fc:propertyExpression><![CDATA[10]]></fc:propertyExpression>
</fc:chartProperty>

Sample: 

References: 

https://www.fusioncharts.com/dev/chart-guide/chart-configurations/fonts