Not possible (outside of the Aura One), the LUT is handled internally by the kernel, and only exposes the same number of steps you're familiar with (and no individual LED control).
The Kindle, on the other hand, handles that mapping in userland, so we *do* have access to individual LED controls. The downside is that the mapping is much less accessible, as it's implemented in powerd, so doing it by hand would require RE & maths.
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