SPIKE: Define API Contract for MappingProfile field mapping definitions

{
  "rule": [{
    "fieldName": "Item identifier name",
    "enabled": true,
    object: [
      {
        "fieldPath": "item.identifiers[].name",
        "value": "book",
        "acceptedValues": [
          {
            "id": "uuid",
            "value": "book"
          },
          {
            "id": "uuid",
            "value": "dvd"
          }
        ]
      },
      {
        "fieldPath": "item.identifiers[].id",
        "value": "$010",
      }
    ]
  },
    {
      "fieldName": "Item title",
      "enabled": true,
      object: [
        {
          "fieldPath": "item.title",
          "value": "$980|a else $020|b",
        }
      ]
    }
  ]
}