The KVD (Key Value Data) app is still in development/prototype phase and there is no official documentation. We will get in contact with you directly.
In general:
The KVD app persistent custom nodes for the ctrlX Data Layer based on a key/value database (KVD).
You can configure explicit nodes or root nodes for implicit (dynamic) child nodes (.../*, .../**), which should be populated to the Data Layer's address space. This can be done by editing configuration file nodes.json or even using REST requests.
EDIT: See official store page here in the community.
