How do you start using Requirements Viewpoint

Add-ons
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I found some useful documentation via

capella-requirements-vp/plugins/org.polarsys.capella.vp.requirements.doc/html/3_userguide/311_diagrams.mediawiki at master · eclipse/capella-requirements-vp · GitHub

and the old thread:

Capella requirements diagram - Capella - Eclipse Capella Forum (mbse-capella.org)