I would like to ask for your support in order to identify the way that we could enable the Processes module on Modern UX. In Modern UX we could not find this module available.
Release : 16.0.3
You should be able to accomplish this by creating channel with url like that.
../../../../../niku/nu#action:pma.ideaProcessInstances&id= ${_internalId}&object_type=idea&object_id= ${_internalId}&ui.page.space=pma.ideaList&ui.page.template=union.appPage