Conditional formatting on Matrix

[Elefante]

HI, I should apply a conditional formatting on a Power Bi pivot table and when I set the rule to define the colors, it is applied taking into consideration the smallest value and the largest value of the entire column. What I would like to do is assign conditional formatting by groups. In my case for each RM group, the values ​​of the S must take the formatting referring to the minimum to maximum value of the group. I insert an image and thank everyone for their availability.