This module enables LED on Nexus 6 phones. Tested on both Marshmallow and Nougat.
RED -- Low battery/low battery charging
GREEN -- Charging
WHITE/BLUE -- Notification
Due to the hardware/driver limitations the LED is non-blinking (always on).
PS. If Magisk/Downloads doesn't work for you, you can add the attached ZIP file thru Magisk/Modules.