How to enable persistent notifications on Android 14?

Hello! Just switched from my old device with android 10 to my new pixel with Android 14 (GrapheneOS), and I'm missing a lot the persistent notification feature of android 10: I used Tasks.org from fdroid to get reminders in my notifications tray, and until I manually clicked "completed" there was no way to remove them, not by swiping nor by clicking "remove all". Now, on Android 14, if I swipe the notification.... It goes away, lost forever. Is there a way to enable the old behavior? Or a workaround to make sure I'll never delete an important notification by accident?

Thanks in advance!