How to automatically calculate daily heart rate per step from Health app data?

A recent paper presented at the current Meeting of the American College of Cardiology in Chicago, the metric of Daily Heart Rate per Step was shown to be strongly associated with cardiovascular fitness and cardiovascular disease outcomes than daily heart rate and step count. Is there any way to automatically extract this from Health app data, or is the number already buried somewhere within the Health app?

[Re-Titled by Moderator]