Sadly there's some things you can't extract essential oil from - apples, kiwi fruit, raspberries and fairy floss to name just a few! But they DO smell amazing in soap, and that's where cosmetic grade fragrance oils come into their own.
A quality fragrance oil is a blend of various chemical components - some natural, and some synthetic. They are carefully formulated and/or blended to the exact specifications of a perfumer.
My handmade soaps contain fragrance oils that are specified soap safe.