curl --request POST \
  --url https://api-dev.narrative.io/mappings/system \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data @- <<EOF
{
  "attribute_id": 123,
  "dataset_id": 456,
  "mapping": {
    "type": "object_mapping",
    "property_mappings": [
      {
        "path": "product.brand",
        "expression": "itemBrand"
      },
      {
        "path": "product.category",
        "expression": "itemCategory"
      },
      {
        "path": "product.id.type",
        "expression": "'SKU'"
      },
      {
        "path": "product.id.value",
        "expression": "itemID"
      }
    ]
  }
}
EOF

{
  "id": "ea9dddd2-e3ee-40b5-b03e-c3cd37c8a7f0",
  "attribute_id": 1,
  "created_at": "2021-12-10T00:00:00Z",
  "dataset_id": 3,
  "mapping": {
    "type": "object_mapping",
    "property_mappings": [
      {
        "path": "foo",
        "expression": "upper(`US Kennel ID`)",
        "dependencies": {
          "properties": [
            "US Kennel ID"
          ]
        }
      },
      {
        "path": "bar.baz.qux",
        "expression": "weight * 10000",
        "dependencies": {
          "properties": [
            "weight"
          ]
        }
      }
    ]
  },
  "status": "active",
  "updated_at": "2021-12-10T00:00:01Z",
  "created_by": 1,
  "updated_by": 1,
  "company_id": 100,
  "scope": "global",
  "source": "admin",
  "derived_from": "ea9dddd2-e3ee-40b5-b03e-c3cd37c8a6f0"
}