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I use an item from the CrazyCrates plugin. Imported it /mm items import basickey.

basickey:
  ItemStack:
    ==: org.bukkit.inventory.ItemStack
    v: 2975
    type: NAME_TAG
    meta:
      ==: ItemMeta
      meta-type: UNSPECIFIC
      display-name: '{"extra":[{"bold":true,"italic":false,"underlined":false,"strikethrough":false,"obfuscated":false,"color":"gray","text":"Кодированый
        ключ"}],"text":""}'
      lore:
      - '{"extra":[{"bold":false,"italic":false,"underlined":false,"strikethrough":false,"obfuscated":false,"color":"gray","text":"Использовать
        на шифровальной машине."}],"text":""}'
      internal: H4sIAAAAAAAA/+NiYOBgEHQuSqyqBBIlqcW6YIqB1SmxODOZAQD0zToSHwAAAA==

I specify drops in the mob configuration

UrbanDrops:
  MinItems: 1
  MaxItems: 2
  Drops:
  - money 500 1
  - plastic 1 0.6
  - basickey 1 0.3

But when killing a mob, only an item without a name and meta data drops out