Does Service Bus REST API support RBAC

I'm very interested to know if/when the Service Bus REST API will support RBAC.  It's my understanding this already works using the .NET API.  I see .NET API samples on GitHub but have yet to try them out.  I'm more interested in getting it working using the REST API 

For now I'll be routing requests to Service Bus via APIM.  I can add a valid authorization header with oAuth token (Bearer ...) for an application with Owner rights for the Service Bus Namespace, but Service Bus complains about the format.  I can also enable the MSI setting for APIM and Service Bus still complains.

Please let me know if Service Bus's RBAC support works for the REST API, or only when using the .NET API.