You can prepare the JFreeChart object and wrap it in JCommonDrawableRenderer, then you can pass it into you jasperreport template as parameter.
In your jasperreport template, you can create an image component and reference the pass-in parameter.
With this method, you can create whatever JFreeChart you want.
After reviewing ireports more I found the multi-axis chart that will give me what I need. The documentation I found that reported JasperReports did not implement the dual axis bar chart threw me off for a while.
Anderson gave himself the promotion. So I gave myself this tiny ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop