Get an asset family

{
  "attribute_as_main_media": "main_image",
  "code": "model_pictures",
  "labels": {
    "en_US": "Model pictures",
    "fr_FR": "Photographies en pied"
  },
  "naming_convention": {
    "abort_asset_creation_on_error": true,
    "pattern": "/(?P<product_ref>.*)-.*/",
    "source": {
      "channel": null,
      "locale": null,
      "property": "code"
    }
  },
  "product_link_rules": [
    {
      "assign_assets_to": [
        {
          "attribute": "model_pictures",
          "mode": "replace"
        }
      ],
      "product_selections": [
        {
          "field": "sku",
          "operator": "EQUALS",
          "value": "{{product_ref}}"
        }
      ]
    }
  ],
  "transformations": [
    {
      "filename_suffix": "_thumbnailBW",
      "label": "Thumbnail plus black and white transformation",
      "operations": [
        {
          "parameters": {
            "height": 150,
            "width": 150
          },
          "type": "thumbnail"
        },
        {
          "parameters": {
            "colorspace": "grey"
          },
          "type": "colorspace"
        }
      ],
      "source": {
        "attribute": "main_image",
        "channel": null,
        "locale": null
      },
      "target": {
        "attribute": "thumbnail",
        "channel": null,
        "locale": null
      }
    }
  ]
}