Endurance and hill score

Hi all

I’m fairly new to Garmin, having purchased a 255 some time ago.

While exploring the Connect web app, I noticed the “Endurance Score” and “Hill Score” report tabs. What strikes me as curious is that a metric like “Training Readiness” doesn’t appear.

Perhaps I’ve simply overlooked it before, but is this a recent addition, or has it always been part of the interface?

Could this indicate that the 255 might soon support these metrics?