curl --request POST \
  --url https://api.example.com/api/CustomFields/PredefinedValues/{fieldId} \
  --header 'Content-Type: application/json' \
  --data '
{
  "values": [
    {
      "id": 123,
      "fieldId": 123,
      "value": "<string>",
      "isDefault": true
    }
  ],
  "deletedIds": [
    123
  ]
}
'