log4js how to set default logging levels for channels

logger_conf.json

{
  "replaceConsole": false,

  "appenders": [
        {
            "type": "console",
            "layout_": {
                "type": "pattern",
                "pattern": "%d %p %c - %m"
            }
        },

      {
          "type": "file",
          "filename": "logs/__log__",
          "maxLogSize": 2048000,
          "backups": 30,
          "category": "[all]"
      }

    ],

    "levels": {
        "[all]": "ALL",
        "App.SPort": "ALL",
        "App.SQL": "OFF",
        "App.Scheduler": "ALL"
    }

}