logfmt syntax error with Grafana cloud

[mjp0]

I can't get this to work with Grafana cloud because of logfmt parsing issue. I've tried different combos with json and format parameters but either log is transferred just as a string with no field (when json is false) or I get the a parsing error logfmt syntax error at pos 2 : unexpected '"'.

My config:

new LokiTransport({
  host: e.LOKI_HOST,
  basicAuth: e.LOKI_AUTH,
  labels: { job: id },
  json: true,
  format: winston.format.json(),
  replaceTimestamp: true,
  onConnectionError: console.error
})

Both logger.info('foobar') and logger.info({ message: "foobar" }) fail with the same logfmt error.

Any ideas?