Contrary to what OnePlus have said, the code for the Always on Ambient Display is in the first beta of Oxygen OS 11. All you have to do is enable the feature, which is disabled in the "OPFeatures" framework. This is very simple, and can be done in two lines in a root terminal (ie. do "su" first):
After you have done this, the option to enable it will appear in Settings > Display > Ambient Display > Always on ambient display.
This doesn't survive a reboot, but you can have Magisk do it on boot for you. Only the first line is required for this (since SystemUI won't have started yet), simply drop the .sh file from the attached zip into /data/adb/service.d, set its permissions to rwxr-xr-x (chmod 755) and reboot. Please note that the zip is not flashable and cannot be used as a Magisk module. Something as simple and temporary as this (hopefully anyway, OnePlus have said this feature will come later) doesn't need a full blown Magisk module.

Code:
setprop sys.aod.debug_support_always_on 1
pkill systemui
This doesn't survive a reboot, but you can have Magisk do it on boot for you. Only the first line is required for this (since SystemUI won't have started yet), simply drop the .sh file from the attached zip into /data/adb/service.d, set its permissions to rwxr-xr-x (chmod 755) and reboot. Please note that the zip is not flashable and cannot be used as a Magisk module. Something as simple and temporary as this (hopefully anyway, OnePlus have said this feature will come later) doesn't need a full blown Magisk module.

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