Hi @Steffen Stamprath,
As @Sachin Dhamale points out, you can use the Comala Workflow - Reporting Integration Plugin, but only if your Comala Workflows version is <4.12 (Confluence 5.10). Because that version includes the Workflow-Reporter macro so this add-on is no longer needed from that version upwards. Check this page for further details.
Hope this helps,
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