'Get unique value using Quicksight

My data has a {NPS} field that I want to get the mean value. Due to my other data in the same dataset, the values are not unique. I want to get the unique {NPS} value from a person into a month, using Quicksight. This is whats the table looks like:

Date Person NPS
nov/21 P.1 10
nov/21 P.1 10
nov/21 P.2 8
feb/22 P.1 9

In the end, I want to have something like that:

Date Person NPS
nov/21 P.1 10
null null null
nov/21 P.2 8
feb/22 P.1 9


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