An IEnchantment essentially is an IEnchantmentDefinition and an enchantment level.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import.
import crafttweaker.enchantments.IEnchantment;

ZenGetter	ZenSetter	Type
ZenGetter definition	ZenSetter ​	Type IEnchantmentDefinition
ZenGetter level	ZenSetter ​	Type int
ZenGetter displayName	ZenSetter displayName	Type string

You might want to get the Enchantment's NBT-Tag.
You can either cast it as IData or use the method:

ZenScript
 Copy
ench.makeTag();
ench as crafttweaker.data.IData;