Fitness App - Change Name of Workout

Hi,

I have an Apple Watch Ultra that I use for running. I've stopped using Strava so want to use the Fitness app to monitor my running. I want to edit the run details like I can in Strava (change name of the run - e.g. local flat 5k) and maybe add comments about the run, or even photos).

All of this is achievable in Strava - but i can't even find the basic option to change the run name?

Thanks