API for metadata

[Solo Leveling]

There doesn't seem to be an object for Copyright or Phonographic Copyright in the API, is there a reason that isn't included?

many albums use Manufacturer also for Copyrights but Phonographic can only be found through the original page.

example:
https://vgmdb.net/album/31137
https://vgmdb.info/album/31137?format=json


If there's another way to retrieve that information I would love to hear it, have a wonderful day/night.