https://www.spigotmc.org/resources/enchantmentplus.84139/
This is a fork of the already added Zenchantments plugin, but its updated to work to 1.16, the original Zenchantments only supports versions up to 1.15 and the original autor said that maybe he will start working on it again, so until Zenchantments is outdated it would be pretty nice to have this as an alternative.