How to write a Java class that is converted to JSON by Log4j2 JSONLayout automatically?

Log4j2's JsonLayout converts the LogEvent content to JSON like this:

Java:

  logger.info("This is an info message");

Output:

{
  "timeMillis" : 1598613343782,
  "thread" : "main",
  "level" : "INFO",
  "loggerName" : "com.example.Test",
  "message" : "This is an info message",
  "endOfBatch" : false,
  "loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
  "contextMap" : { },
  "threadId" : 1,
  "threadPriority" : 5
}

But when an object(bean) is passed to Logger, it spits the message as string.

Let's say my bean is something like this:

public class MyLogBean {
    private String message;
    private String userId;
    private String ip;
    public MyLogBean(String message, String userId, String ip) {
        this.message = message;
        this.userId = userId;
        this.ip = ip;
    }
    public MyLogBean() {}
    public String getMessage() {return message;}
    public void setMessage(String message) {this.message = message;}
    public String getUserId() {return userId;}
    public void setUserId(String userId) {this.userId = userId;}
    public String getIp() {return ip;}
    public void setIp(String ip) {this.ip = ip;}
}

Then if try to write MyLogBean with something like this: Java:

    logger.info(new MyLogBean("UserLogged","john.appleseed@example.com","192.168.1.56"));

Output:

{
  "timeMillis" : 1598613343782,
  "thread" : "main",
  "level" : "INFO",
  "loggerName" : "com.example.Test",
  "message" : "com.example.MyLogBean@328cf0e1",
  "endOfBatch" : false,
  "loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
  "contextMap" : { },
  "threadId" : 1,
  "threadPriority" : 5
}

It prints "com.example.MyLogBean@328cf0e1" as message.

How to make it write the message in JSON like this:

{
  "timeMillis" : 1598613343782,
  "thread" : "main",
  "level" : "INFO",
  "loggerName" : "com.example.Test",
  "message" : {
      "message":"UserLogged",
      "userId":"john.appleseed@example.com",
      "ip":"192.168.1.56"      
  },
  "endOfBatch" : false,
  "loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
  "contextMap" : { },
  "threadId" : 1,
  "threadPriority" : 5
}

I need MyLogBeanclass to be converted to JSON automatically by JsonLayout. Unfortunately by default, JsonLayout uses toString method and put all object content as string.

I've tried to convert it to JSON by implementing MyLogBean class with Log4J Message interface but it still uses a string method(getFormattedMessage). Even if I use a string to JSON converter, the message again become a string the output become something like this:

{
  "message" : "{\"message\":\"UserLogin\",\"userId\":\"john\",\"ip\":\"10.2.3.4\"}"
}