Structured Logs in Google Cloud Run not being parsed (using Winston for logging)

I'm attempting to format my logs in such a way that Google Cloud will correctly extract the log level. This is running on Cloud Run, with typescript. Cloud Run is grabbing the logs from the container output.

If I do the following, google correctly parses the log line:

console.log(JSON.stringify({
   severity: 'ERROR',
   message: 'This is testing a structured log error for GCP'
}));

And the log output looks like this:

I've tried a number of different ways to format with winston, ended up with the following:

useFormat = format.combine(
      format((info, opts) => {
        info['severity'] = info.level;
        delete info.level;
        return info;
      })(),
      format.json());


    this.winston = winston.createLogger({
      level: logLevel,
      format: useFormat,
      transports: [new winston.transports.Console()]
    });

Which looks like it will work (it correctly outputs the json line), I get this in the GCP logs:

Any help appreciated.

Turns out I was close, just needed to .upperCase() the log level (and I'm mapping Verbose -> Debug, I don't really understand why GCP decided to do a totally different log leveling system than everyone else). New code:

useFormat = 
    format.combine(
      format((info, opts) => {
        let level = info.level.toUpperCase();
          if(level === 'VERBOSE') {
            level = 'DEBUG';
          }

          info['severity'] = level;
          delete info.level;
          return info;
      })(),
      format.json());