In theory, the JAR file needs to be added to the shared-classes directory of either the BROKER, NODE or EG and then that appropriate level re-started to load that JAR, ready for ITX to use.
I have tested this functionality, and it unfortunately doesn't seem to work. I've tried dozens of variations. The exact same issue was found and fixed in an older version of TX (WTX 8.4.1) but may have crept back in.
It will not be feasible for me to raise this internally, so I urge you to open a support case to get this reviewed.
Thanks.
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Paul Brett
IBM Sterling Transformation Extender (ITX) Client Support
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