Is there any way to import e.g. GPX route map to Apple Watch Ultra and use it for navigation when running?

I bought a Apply Watch Ultra for ultra running (because of the longer battery life than my old Garmin watch), for ultra races self-navigation is essential and most races provide the route map by GPX or other format files. Is there any way to import the route files like GPX to Apple watch ultra? then I can do real-time navigation while running the course, at least by the GPS coordinates even if no graphic map like Garmin.

If there is no way I will be very dissappointed and can't understand how a watch designed for ultra don't support probably the most important and basic feature for ultra running.

Thanks!