在SLF4J中使用JSON日志时，如何包含多个JSON字段？

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.32</version>
</dependency>
<dependency>
    <groupId>net.logstash.logback</groupId>
    <artifactId>logstash-logback-encoder</artifactId>
    <version>6.6</version>
</dependency>

<configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder class="net.logstash.logback.encoder.LogstashEncoder" />
    </appender>
    
    <root level="INFO">
        <appender-ref ref="STDOUT" />
    </root>
</configuration>

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;

public class MyClass {
    private static final Logger logger = LoggerFactory.getLogger(MyClass.class);
    
    public void myMethod() {
        MDC.put("field1", "value1");
        MDC.put("field2", "value2");
        
        logger.info("Logging with multiple JSON fields");
        
        MDC.clear();
    }
}