Thanks to @motion4all a basic but useful telemetry is now available, you can download the plugin here : 
https://www.racedepartment.com/downloads/wrc-telemetry-patch.38991/

Install instructions are available on the page.

You don't need to use the dirt rally 2 protocol this version supports natively the telemetry patch without additional work. 
Simply start the game as you usually do with no extra arguments.