@Hari-Seldon I no longer have the Suunto Run to test it, but the Garmin HRM Pro+ does these things:
****RUNNING DYNAMICS
HRM-Pro Plus captures running dynamics — such as vertical oscillation, ground contact time, stride length, vertical ratio and more — to help improve your form and enable running power on your compatible Garmin watch****
I am assuming that you can now see these things when you use the HRM with your Run.