Applying specific criteria to a custom calculation

Is there a way to apply specific criteria/filters to a custom calculation?

I have a measure that is essentially just a distinct count. I then want a calculation to take the measure apply some criteria and divide it with the same measure but with different criteria.

For example:

Count of people where shirt color is red divided by count of people where shirt color is blue.

I can make this change in the cube and do it with DAX, but is it possible to do it with a custom calculation in the front end?

DAX would look something like

DIVIDE(
    CALCULATE(
        DISTINCTCOUNT('Dim_People'[PersonID]),
        'Dim_People'[ShirtColor] = "Red"
    ),
    CALCULATE(
        DISTINCTCOUNT('Dim_People'[PersonID]),
        'Dim_People'[ShirtColor] = "Blue"
    )
)

The idea is really to have two KPI objects: One with count of people with red shirts and then a second KPI object where it's count of people with red shirts divided by count of people with blue shirts. Maybe you are able to refer to measures in separate objects somehow to obtain this?

Thanks!