Feature Request - RGB eye dropper

Dear Support,

I just was using the color select that is on the primary color wheel to set the blackpoint and white point.
It is really handy to see the RGB value, but it would also be handy to see the luminace value right next to it. As for setting the black point I am also looking for the darkest point.

Secondly
That feature above would also be handy with the qualifier, as seeing the rgb value and luminance value could aid in selecting the darkest or whitest point on an image.

Question
Is there a function in reselve that does a "show darkest pixels or show brightest or whitest pixels?

Thanks you in advance,
Robert