Wondering how the new graph for career of interest in opporuinity marketplace place

Hi, the new competecny graphs that now shows when searching careers of intersted to add to 'favourites' how does this work?

If an employee has any of these competencies, how does it show 'their level' on this graph? Does this graph pick up ratings from their performance review? Is it solely based on if this is added a development goal and then how that goal is tracked? I have had a few questions about this and I'm not entirely sure.

thank you!