How to make serialized object string in serialized object readable with avoiding \u0022 characters in C#?

Question

I am serializing an object with JsonSerializer and assign this string into another object's property. Then I am serializing this parent object again and writing to a file. But there are so many characters like \u0022, \u002B etc. Is there a way to make this inner serialized object string looks pretty and readable that doesn't contain these unreadable characters? (One possible option; replacing these characters with empty string, because I need to deserialize it somewhere else)

Parent class:

public class LogItem
{
    public string Application { get; set; } = "";
    public string AdditionalInfo { get; set; } = "";
    public ResponseLogItem Response { get; set; } = new();
    public RequestLogItem Request { get; set; } = new();
}

AdditionalInfo is a serialized object string of this class:

public class IncomingMessage
{
    public string time { get; set; }
    public string type { get; set; }
    public string description { get; set; }
    public string from { get; set; }
    public string to { get; set; }
    public Message message { get; set; }
}

Here is my code:

var options = new JsonSerializerOptions
{
   Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
   WriteIndented = true
};

var messageString = JsonSerializer.Serialize(incomingMessage);     
var messageLog = new()
   {
       Application = "Message", AdditionalInfo = messageString
   };

var fileName = "messageLog.txt";
textLogger.Log(messageLog, fileName, token);

This textLogger is another service for writing logs.

Here is log file:

  {
"Application": "Message",
"AdditionalInfo": "{\r\n  \u0022time\u0022: \u00222022-05-03T16:48:12.4957321Z\u0022,\r\n  \u0022type\u0022: \u0022message-received\u0022,\r\n  \u0022description\u0022: \u0022Test\u0022,\r\n  \u0022from\u0022: \u0022\u002B90555555555\u0022,\r\n    \u0022to\u0022: \u0022\u002B90555555556\u0022,\r\n \u0022message\u0022: {\r\n    \u0022id\u0022: \u0022abc1239\u0022,\r\n    \u0022time\u0022: \u00222022-05-03T16:48:12.4957321Z\u0022,\r\n    \u0022text\u0022: \u0022Test 3\u0022,\r\n    \u0022applicationId\u0022: \u00220a1ea845\u0022,\r\n    \u0022direction\u0022: \u0022in\u0022,\r\n}\r\n}",
"Response": {
  "StatusCode": "",
  "Duration": "0",
  "Body": "",
  "HeaderJson": ""
},
"Request": {
  "QueryString": "",
  "Body": "",
  "Scheme": "",
  "Path": "",
  "Host": "",
  "Method": "",
  "ReceptionDate": null,
  "HeaderJson": "",
  "Ip": "",
  "Environment": "",
  "User": ""
} }