Energy & Climate - need to implement different scale

Hi, according to local law, I need to have a different scale (no CO2, but fGEE-values):

Klasse fGEE
A++ ≤ 0,55
A+ ≤ 0,70
A ≤ 0,85
B ≤ 1,00
C ≤ 1,75
D ≤ 2,50
E ≤ 3,25
F ≤ 4,00
G > 4,00

So, in the configuration, I added this:
Value: Please enter value of Co2 graph, separated by comma: 0.55,0.70,0.85,1.00,1.75,2.50,3.25,4.00

The fGEE-value of the example property is: 0.60


But the graph is rounding up 0.6 to 1.00 and also the scale is shown in the wrong way. See screenhot


Any chance to fix that?
It´s a nice feature, I would love to use it for my properties.

Thanks,
Alex