Apple NI accessory application integration with DW products

Apple has recently announced a protocol to communicate with third party UWB manufacturer including DW products. In the documentation, it is mentioned that the accessory needs to send a Accessory configuration data message to Apple device to start a NI session for ranging. Here is content of that message:

In the list of parameters, the UWBConfigData parameter has to be provided by the middleware for embedded applications. I was wondering if there is a standard defined by DW to describe UWBConfigData?