drmParams should be added to the ContentNode (or ContentMetadata if we have differentiated it in the type system). At a minimum, just mark it as an AssociativeArray. But it would be better if we could add a full interface for this structure, with the following attributes.

https://developer.roku.com/en-ca/docs/developer-program/getting-started/architecture/content-metadata.md#digital-rights-management-drm-control-attributes