Is it possible to have live information about your overall and graded position during a race and time gap? Perhaps this info could appear as the top 2 riders on the Riders Ahead / Behind list. If you are the race leader it could show you at the top with a race leader flag.
Make sure you vote up the existing suggestions so Zwift can implement it if popular enough: https://support.zwift.com/hc/en-us/search?utf8=%E2%9C%93&query=Realtime+race+position&commit=Search