There is a new flag added called
Quieter notification permission prompts
Enables quieter permission prompts for notification permission requests. When a site wishes to show notifications, the usual modal dialog is replaced with a quieter version. – Mac, Windows
To use flags, enter this into your Edge insider address bar: edge://flags/
you could test it on websites like this https://tests.peter.sh/notification-generator/
I think these are nice options that are pretty useful when websites use annoying constant notification spams.
hopefully after some time, these options will be added to the settings page