Is this what you were asking for when you say dark mode for app drawer?
Since I think you are on Android Oreo 8.1. You can only achieve this by choosing a dark wallpaper on the background.
Android Pie is soon to be available for Nokia 3.1. So, you should be able to manually change into dark mode once it arrives by going to Settings->Display->Device Theme.
If you were talking about anything else then its almost sure that Google is going to implement system wide dark mode in Android Q. So we have to wait for that.
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