We highly appreciate your interest in this feature and after doing some research, it appears to potentially be released at the end of this month, if there will not be any delays. The documentation page that you shared is not loading as a result of the feature not yet being fully deployed.
I do not have additional information to share at the moment, but if you will be getting the same error message after it’s release, do not hesitate to reach out to us and we will look into what can be done to have it enabled for you.