Shulker crystals

Levitation is a pretty useful effect under the right circumstances, but there isn't any way to get it besides letting yourself get attacked by a shulker, which isn't always the best option, so I think there should be a way to get it yourself at any time, with shulker crystals. Shulker crystals would be a common drop from shulkers, dropping up to three at a time for every shulker you slay, alternatively, if you want a more renewable source, they would occasionally drop when you smack the projectiles they shoot