Laravel stdout log adding extra keyword in log

I have tried with both inbuilt channels and custom ones as well whenever I am logging something in the terminal/stdout WARN keyword is added before the log.

Laravel log in terminal

but the same logs are coming as they are supposed to be in the log file
Laravel log in file

in my use case I need the logs in json format in the terminal but because of the keyword it is coming as string.

This is logging method(I have tried the same with inbuilt channels like single … but same)

        'methodlog' => [
            'driver' => 'custom',
            'via' => AppLoggingMethodLogChannel::class,
            'formatter' => AppLoggingCustomJsonFormatter::class,
            'name' => 'methodlog',
            'with' => [
                'path' => storage_path('logs/laravel.log'),//'php://stdout',
                'level' => env('LOG_LEVEL', 'debug'),
            ],
        ],        

Edit:
CustomJsonFormatter.php

class CustomJsonFormatter extends JsonFormatter
{
    private $DEFAULT_JSON_FLAGS = JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRESERVE_ZERO_FRACTION | JSON_INVALID_UTF8_SUBSTITUTE | JSON_PARTIAL_OUTPUT_ON_ERROR ;
    public function format(LogRecord $record): string
    {
        $formatted = $record['context'];

        if ($this->includeStacktraces) {
            $formatted['stack_trace'] = $record['formatted']['exception'];
        }

        return $this->toJson($formatted, true) . ($this->appendNewline ? "n" : '');
    }
}

MethodLogChannel.php

class MethodLogChannel
{
    public function __invoke(array $config)
    {
        $log = new Logger($config['name']);
        $handler = new StreamHandler($config['with']['path'], $config['with']['level']);
        $handler->setFormatter(new CustomJsonFormatter());
        $log->pushHandler($handler);
        $log->pushProcessor(new IntrospectionProcessor());
        $log->pushProcessor(new WebProcessor($_SERVER));
        return $log;
    }
}

for saving logs

Log::channel(‘methodlog’)->info(”, $log_message);