Other routing systems will have similar file-export/download functions, and if you have an account on that system—which may offer access to published routes for free—you may find it is compatible with your device even if it's from a competing manufacturer (for example, Wahoo! head units can retrieve Garmin Connect routes directly, even though the two companies are in direct competition).
After you have the file, you can import it into your preferred route system. It is out-of-scope to provide instructions on how to utilize your chosen tool, but one thing to keep in mind when importing our routes: a number of routing systems have the option to "re-route" after importing to accommodate information/intelligence built into the tool.
DO NOT use these "smart" re-routing functions!
For private rides, this feature can be very helpful, but our routes are previewed & planned based on recent construction information and/or property traversal permissions, and "smart" re-routing could take you off the planned route in significant ways, particularly if we have permissions to cross property that the routing tool would consider to be an invalid segment. Going off-route in significant ways takes you away from help & support, and we want everyone to stay safe while enjoying their ride.