Adding descriptions to the form fields from schema

I'm not sure if this is possible without changing Drupal core. If you would add custom properties not listed in https://www.drupal.org/docs/drupal-apis/configuration-api/configuration-... → to your schema, it will not be valid according to Drupal core.

Hmm, I thought that we can add more custom properties without breaking the schema. If not, maybe we can suggest extending the schema then? Cuz field labels without descriptions make too little sense for users :)