They do have CCS chargers in the nav in Europe and Australia, but it seems they haven't rolled it out to North America yet. (Or there are no CCS chargers that meet the requirements to be listed.)
Third-party fast chargers that meet our performance and reliability standards will be added to Tesla’s navigation automatically as Qualified Third-Party Chargers.
www.tesla.com
Given those requirements, and that for example EA charges significantly more than Tesla, I wouldn't think enough Tesla drivers are using them to get the data necessary for them to be listed.
They probably got a lot of good data last year when EA had the system issue and the chargers were in free mode. But my success rate was below 90% on all of the EA sites I attempted to use to take advantage of the free electricity.