Wizard to create pure QML plugins

We need a wizard that creates a new (pure) QML plugin.
For this we have to define a common structure (e.g. imports sub-directory)
and we have to make sure it works (QML_IMPORT_PATH etc.)
How do we manage existing plugins?
Ideally the QML plugin would become special in the project view or the qmldir file would be visible and have an editor.
It should be possible to move components to a plugin.
We should manage the .metainfo file for the designer.
Maybe the template for a QML plugin should already contain one plugin
that contains a singleton for constants, fonts, colors and gradients.