How do I access the new macOS system sounds

I would like the user to choose which sounds to play upon success or failure in my macOS app. How can I get the new macOS system sounds for my picker?? Bop, Breeze, Bubble, etc.??

I have no trouble finding the old sounds, Basso, Bottle, Purr, etc., but I'd like to show the new sounds in the picker. Where are they located?