How to model Data Objects in the web designer?

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How to extend modeler stencilset

I want to add new node to the stencil set in flowable. This node is SubProcess like and has extension elements. example: <subProcess id="simulationSubProcess" > <extensionElements> <flowable:type>simulation</flowable:type> <flowable:virtualEngineConfiguration><![CDATA[${virtualEngineCfg}]]></flowable:virtualEngineConfiguration> </extensionElements> … Do you have any idea how to? Thank you in advance. Martin