Notification App for AOD on Fairphone 4


I have a Fairphone 4 with /e/OS. When missing a call or SMS the notification on the AOD only shows up for a few seconds. That is too short for me. As I did not found a possibility to change that behavior, I am searching for an app, that just simulates the function of an Notification-LED.

As I am using Aurora Store I can not use an app that must be paid for. Is there any app you can recommend me?

pS: I already tried:
Notification Light - aodNotify: most of the functions can only be used in purchase version.
Blitz Benachrichtigung: FP4 don’t has a front flashlight
Glimpse Notifications: uses the lock screen, not the AOD

Am I really the only one with this problem?