You can color using functions like Blue(), Red() and etc, as well as color codes. You will have to think in a formula for the entire column since you won't be able to set a color cell by cell. Do you a pivot table already created in Qlik Sense? Can you send us a screen shot of it ans let us know what you want to see there, so we can try helping you in the actual file?
Based on your object and the expected result we may have a different way of doing it.
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