Version comparison API: Expected machine-readable metadata field names

What steps does it take to reproduce the issue?

1. Have dataset with at least 2 versions
2. Retrieve version comparison via API, e.g. https://demo.dataverse.org/api/datasets/:persistentId/versions/1.0/compare/2.0?persistentId=doi%3A10.70122%2FFK2%2FODTL3M

• What happens?

The returned JSON contains only the human-readable names of the changed metadata fields, not the machine-readable ones like other APIs do:

{
  "status": "OK",
  "data": {
    "oldVersion": {
      "versionNumber": "1.0",
      "lastUpdatedDate": "2025-04-08T11:01:53Z"
    },
    "newVersion": {
      "versionNumber": "2.0",
      "lastUpdatedDate": "2025-04-08T11:02:52Z"
    },
    "metadataChanges": [
      {
        "blockName": "Citation Metadata",
        "changed": [
          {
            "fieldName": "Description",
            "oldValue": "test",
            "newValue": "new description"
          },
          {
            "fieldName": "Keyword",
            "oldValue": "",
            "newValue": "Test"
          }
        ]
      }
    ]
  }
}

I am refering to "fieldName": "Description" and "fieldName": "Keyword". I expected to see dsDescriptionValue and keywordValue instead.

Which version of Dataverse are you using?

v6.6

Any related open or closed issues to this bug report?

Didn't find any.

Are you thinking about creating a pull request for this issue?

Yes, I am open to creating a PR

For example, the dataset API https://demo.dataverse.org/api/datasets/:persistentId?persistentId=doi%3A10.70122%2FFK2%2FODTL3M returns the machine-readable field names as e.g. "typeName": "dsDescriptionValue", so we could simply add a "typeName" key in addition to the "fieldName" key?

Start by reproducing the version-comparison request at the reported API endpoint and compare its response with the dataset API response. Trace how metadataChanges are assembled; done means each changed field retains its human-readable fieldName and also exposes the machine-readable name, such as dsDescriptionValue or keywordValue.