Given the Nokia 8 has no notification LEDs but does have capacitive button backlights there is a possible notification solution.
Custom ROMs have long made notifications via blinking the capacitive button backlights (aka BLN) available.
For me this would be a welcome addition to an otherwise accomplished phone.
PS not necessarily wanting to run custom ROMs on this phone especially if Nokia continue to make good on their promise of fast updates. So addition of BLN as a stock feature is the aim here.