In a flow I need to combine the selection made from 2 radio button fields into 1 field.  Radio buttons are  API field: ProjectRed and API  field:  ProjectGreen    .  The options assigned to the radio buttons are the same:   1st option is 1) choice label is Commerce data 2)Choice Value is Commerce .  2nd option is 1)choice label is Global International  2)choice value is Global .   

When I use a formula field with the formula below, it returns the choice label and NOT the Choice value:

 {!Red} + {!Green}

How can I get the formula to return the Choice value?