Im not sure about the calculations for that specific value but the Gini coefficient itself is an index between 0 and 1 where 0 is no inequality and 1 is maximum inequality.
The index in the link I provided is also between 0 and 1 where the value for one country is only comparable to that of other countries. The higher the number the better but again not sure what the exact components are as it was just an example of quanitifying inequality.
I imagine this measurement is probably adjusted for PPP (purchase power parity). Going from comparing the GDP per capita to a PPP and Gini adjusted GDP per capita (like what that index likely does) should be what you’re getting at. Otherwise, there’s HDI (human development index) also mentioned in the wiki that goes beyond monetary value.