Just download it on the Playstore NotifyBuddy. The app developer XanderApps made an amazing simple app to bring back a simple and beautiful notification light when the screen is off. Easy to configure, allow all the permissions, pick the apps you want it to show the light for, choose a color, and that's it. You can tinker with the settings for the duration of the blink, how long it takes to blink again, and how long it blinks for, which is a big one for me because other apps do not let it go for very long from what I've seen. The developer also said that there is screen in burn protection built-in! The only thing is AOD settings get disabled when there is a notification as well as screen-off fingerprint unlock and a double tap of the screen is needed to wake the phone up, or alternatively press the power button.
No notification light is an issue I had found with the note 10 + coming from the Note 8 and this is resolved for the most part
Lemmi know what you guys think about it !