Extend a "non-basic capella element" in the viewpoint (vptext) files


When creating a DSL viewpoint with Capella Studio, the data.vptext allow us to “extend” classes from CAPELLA basic classes, such as Logical components or Physical Components:

Capella studio does help with the auto complete feature.
However, the auto complete feature would not include Classes that are not native to Capella.

How to import new classes into the Capella Studio IDE developing the the DLS viewpoint? I tired to insert “import lines” into the data.vptext but that would produce error messages, indeed it is expecting a “data” as a first line; No Import.

I would like to be able to EXTEND classes that are not native to Capella, such as classes from the Capella Add-ons let’s say. And then use them in Capella Studio. Is that possible?

I figured it could be a simple

  • Add add-on into dropings of Capella Studio, then → Activate the add-on with the Kitalpha manager.
    This does not seem to work, since the vptext files are not “models”:

I figured it could be depending on dependencies withing the plugin.xml?
I went there and Added all plug-ins related to the word “requirement” let’s say → could not seem to find the the plug in related to the ADDON Capella Requirement → Which Is a Non Basic Capella Element. It is provided by an external add-on.

What else could be done to be able to extend a requirement from the REQ add-on let’s say?