example.rasi

* {
    width:      100px;
}

examplescript.sh

#!/usr/bin/env bash
chosen=$(echo -e "1\n2" | rofi -dmenu)
case $chosen in
    1)
        echo "chose 1"
        ans=$(rofi -dmenu -i -p "Exit? (y/n)" -theme example.rasi)
        ;;
    2)
        echo "chose 2"
        exit 0
        ;;
esac
echo $ans