Support for plugins / types that implement custom vocabularies

[a-recknagel]

Jsonschema allows for the definition of custom vocabularies which may or may not be supported by tooling like this project. Let's say I have something like this

{
  "type": "object",
  "properties": {
    "ibanFormat": {
      "type": "boolean",
      "description": "Indicates that the instance must be a valid IBAN."
    }
}

as a meta-schema which I'd somehow bind into my actual schema in order to use it like so:

{
  "properties": {
    "my_iban": {
      "title": "My Iban",
      "type": "string",
      "ibanFormat": true
    }
  },
  "required": [
    "my_iban"
  ],
  "title": "Foo",
  "type": "object"
}

How could I tell datamodel-code-generator that there is some type that satisfies this condition? What would be the constraints to fulfill this, do I need to provide a function that'd be used as a validator, or a complete type that inherits from pydantic.Baseclass? And how would I plug them in?