Properties Plugin - Composite default properties by setting multiple documents in pattern

Currently, it doesn't allow to set multiple labels document for a properties instance. For example, with PropertiesManagerImpl, we can set single document for the properties, but we cannot set multiple labels document as composite properties. This is not so convenient in practice.
If it is possible to configure a pattern instead of document name, e.g, "labels*", then it must be really useful in projects.