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UI extensions are still being developed, but you can find some documentation here (keep in mind these docs may be slightly outdated and will continue to be updated). You don't need to use Verdaccio to create a pkg or app as the npm packages can be found here, namely

@rancher/create-app

or

@rancher/create-pkg

depending on your use case. As for an extension that could be used on a cluster level you can reference this repo, the routes you create for your extension will determine the scope. See these routes as an example.

Tried out the kubewarden ui. The experience was great, and similar to what I wanted. Thanks a lot for sharing. Helps me make much more sense.