Category Chart Alphanumeric x-Axis in Report

I would to get something like this in a Report
image

The x-Axis is alphanumeric. I would like to use XYChart or maybe BarChart is a best option?
The way to take this is by Scripcting using JFreeChart object but I’m not sure how thw syntax should be to modify the axis type.
Please some help!

Is that even possible in a report?

I’ve made some progress in XYChart
image

but I can not delete those gray bars. No matter how much I set up some properties. Does anybody knows how to deal with it?