Caveat Emptor: Untested-
Not very simply, but you could checkout the Chart Macro Source here:
https://bitbucket.org/atlassian/confluence-chart-plugin
And change: confluence-chart-plugin/src /main/java/com/atlassian/confluence/extra/chart/ChartDefaults.java
Lines 15-16
public static final Font defaultFont = new Font("Helvetica", Font.PLAIN, 10); public static final Font titleFont = new Font("Helvetica", Font.BOLD, 20);
to whatever you want, then rebuild the package... then install it.
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