curl --request GET \
  --url https://api.standardmetrics.io/v1/custom-columns/options/ \
  --header 'Authorization: Bearer <token>'

{
  "count": 123,
  "results": [
    {
      "id": "<string>",
      "name": "<string>",
      "type": "<string>",
      "options": [
        {
          "id": "<string>",
          "value": "<string>",
          "color": "<string>"
        }
      ]
    }
  ],
  "next": "<string>",
  "previous": "<string>"
}