Q: How to register my own defined WorkitemHandler in jbpm-console?

Say I wish to define a process containing a custom service task running in jbpm-console. Here is my imagined steps:

1. define a java class which implements Interface org.kie.api.runtime.process.WorkItemHandler and package the class into a jar.

2. upload the jar into jbpm-console

3. add the jar into the project containing the  process as dependency.

4. But I can't find a way in Business Process Editor web interface in jbpm-console to register my own WorkItemHandler implementation.

Is it doable? Or my whole idea is wrong? I am on learning.

Any help is appreciated.

Thanks

Chen