The StateApi exposes a method to subscribe to a storage changes: https://github.com/rankanizer/polkadart/blob/e9b690f1dd4ef1828cbfc51272dc7f32b4261ace/packages/polkadart/lib/apis/state.dart#L174
However, the generated code doesn't create a method for subscribing to a storage value. Additionally, the generated type containing the knowledge of the storage key hash and of how to decode this type is private.
Am I missing something here, or can we currently not subscribe with the concrete type information of the generated code?