metadata does not store tags/custom content fields

[PatrickGeyer]

Describe the bug
Metadata object does not store tags or custom content:

  /// convert to nip01 event
  Nip01Event toEvent() {
    return Nip01Event(
        pubKey: pubKey,
        content: jsonEncode(toJson()),
        kind: kKind,
        tags: [],
        createdAt: updatedAt ?? 0);
  }

Is it impossible to use the metadata usecase to fetch profiles that store other content fields?
Say if I want a custom field or tag on the metadata event, and I want to use NDKs caching mechanism for metadata, I suppose that's impossible.

Until recently, nostr-protocol/nips#2216, NIP-39 allowed us to store external identities on "i" tags on metadata, but using NDKs metadata functionality strip that information.

Are there any plans to store the raw/complete metadata or will it always be the stripped down version?