Default Analog Watchface Data options / no Heartrate / 0hr?

Hi!
Why is there no current-Heartrate option in the default analog Watchface? Too much powerconsumption?

These are the options:

system symbols
date 1
date 2
steps
kcal
climbed floors
intensity minutes
battery
sunset/rise
alt
barometer
UTC time
next cal event
messages
Recovery Time
last run
"fenix"
none

What does "0hr" do?
Also it would be cool to be able to change the UTC time to a digital local time.