Q: heart rate overview

Hi

That is not presently possible via the built-in apps on Apple Watch.

I guess apple will have to invest a bit more in the built in health app, specially now that the new watch is even more focused on workouts; I would love to see more workout features like this not depending on third-part apps, that are great by the way, but some times dont bring all the data to health app and by extension for the entire apple health ecosystem...

Hi

If you would like to suggest that Apple considers adding new features, you can do so here:

https://www.apple.com/feedback/watch.html