This has been requested many times over many years and Zwift have not been interested. The creation of the Climb Portal is a sign that the technology you’re looking for has already been partly implemented, but they’re still trying to ensure that all roads are packed with riders (thus the limited selection of Climb Portal routes, just like the limited selection of worlds, on any given day). My guess is any feature that would tend to serve people who are happy riding entirely alone will be a non-starter.