You can PM me and I'll send a link of some. Who you are testing has a whole lot to do with what you will see. I think you will need a huge data set or rec (that wear HRMs) and use power to elite. Then there are quite a few elite that do not record power, likely more that do.
At lower effort levels there is just a lot of noise. The rider is moving, talking etc. and using HR/energy on many things other than power. Same in many races. Holding consistent power [should not be]/is not the goal. A tourest tourist might show steady effort - if they also wear a HRM and use a PM.

I think Time Trial (race) data is going to be cleaner data. Here you have a rider trying to maximize their efficiency, so all the HR beats are designed to go fast. A good rider is faster in part because they can control where their effort goes. In general these rider train for that and some use HR and some use power, and some just feel to get their optimum performance. But it is the least "noise".

This is a TT that is a 300' / 7 mile climb out and back. Winds are pretty consistent from year to year.

Match up the VOS Stage Race TT with what you see on Strava. White Mountain Road Club ? Celebrating over 35 years (1980-2017)
It is work. I have done it for the riders I care about.

https://www.strava.com/segments/3438723
The riders with the lightning bolt were using a power meter. As mentioned many do not show both HRM and power (on purpose). This is an early season race for most, so the rides here will be a bit off of peak (other the most JrM 17-18).