This converter probably won't work right now, since this data type does not match what the data definition produces. Can you write a unit test for it to ensure it works? Take a look at converter tests from the reporting module, like [this one](https://github.com/openmrs/openmrs-module-reporting/blob/master/api/src/test/java/org/openmrs/module/reporting/data/converter/AgeRangeConverterTest.java).