public class LocalizedConverter : JsonConverter
    {
        private string _keyField;
        private string _valueField;
        private CamelCasePropertyNamesContractResolver _resolver;

        public LocalizedConverter(string keyField, string valueField)
        {
            _keyField = keyField;
            _valueField = valueField;
            _resolver = new CamelCasePropertyNamesContractResolver(); ;
        }
        public override bool CanRead => false;

        public override bool CanConvert(Type objectType)
        {
            return true;
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            //Should not be called because CanRead=false
            throw new NotImplementedException();
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            JToken t = JToken.FromObject(value, new JsonSerializer() {
                ContractResolver = _resolver
            });

            if (t is JObject o)
            {
                var field = _resolver.GetResolvedPropertyName(_valueField);
                o.Property(field).Value = "localized";

                o.WriteTo(writer);
            }
            else
            {
                t.WriteTo(writer);
            }
        }
    }