Nivo calendar zero value color

[samwangshein]

Is your feature request related to a problem? Please describe.
Nivo calendar zero value color should be distinguished from calendar days with values. I've tried over and over to show the value zero as gray while the other days with distinguished colors but I'm still met with the same problem of often having values of 1 have the same color as 0. This is not because my API data is not working it is simply because there is no feature for the nivo calendar to distinguish these colors.
Describe the solution you'd like
Make the color for zero customizable and I'm not talking about emptycolor because that as an undefined value. I'm talking specifically about making days with the value zero have colors that are customizable.
Describe alternatives you've considered
Tried using tooltip but this has been not helpful
Additional context


above shows that 0 and 1 have same color value
below shows what I get when I don't input days with zero value. This does have the distinguished color effect but I can't get the value when I hover over the calendar: