Strapi custom logger configuration

I have got a Strapi v4 app with the following:

./config/logger.js

'use strict';

const {
  winston,
  formats: { prettyPrint, levelFilter },
} = require('@strapi/logger');

module.exports = {
  transports: [
    new winston.transports.Console({
      level: 'debug',
      format: winston.format.combine(
        levelFilter('debug'),
        prettyPrint({ timestamps: 'YYYY-MM-DD hh:mm:ss.SSS' })
      ),
    }),
  ],
};

and additionally in my ./config/functions/bootstrap.js i have got the following code

 'use strict';

/**
 * An asynchronous bootstrap function that runs before
 * your application gets started.
 *
 * This gives you an opportunity to set up your data model,
 * run jobs, or perform some special logic.
 */

module.exports = () => {

    console.log("Hello World!");
    logger.log("debug","Hello Strapi app!");

};

Unfortunately i do not see it anywhere printed in my folder Strapi app or Web browser. Any idea that could help me?

Regards