Does someone know how providers work?

[indiwine]

Hello,

Since there is basically zero documentation, its quite hard to start creating .ide-toolbox.metadata.json on your own.
Does someone know how to use providers?
Especially I am interested in source type provider, like this:

{
      "name": "dependency_context_classes",
      "source": {
        "contributor": "return_array",
        "parameter": "\\ema\\Users\\AccessControl\\SomeProvider:export"
      }
}

So I can load hinting data dynamically, am I right?

Thanks.