How to show default values in settings page extended from RecordEditForm

I am building a module and for my module I have a confg settings page (extended from RecordEditForm). I want to know how to add the default value text for each field as in other config pages (like in attached image)


On each field you’ve defined in your PersistentRecord subclass you can call setDefault to set a default value.

Thanks so much. Worked like a charm