Token Night Vision ? Grey Scale

I know there is a way to change the color of a players token vision, but I would love to be able to set it to a "Grey Scale" to represent Dark Vision a bit better.  Is there a setting to be able to do this or is this something that may come about in the future?

I set my players' color of darkvision to blue. This causes everything to look kind of monochrome, which is essentially black and white.

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