Ah thanks.Yes makes sence, a kind of vector scaling with a white point i guess.
btw i found this site where you can copy paste almost all colospace transformations.
I have tryed it works with OCIO inside Blender too.
Ah you are sponsor from this site.
https://www.colour-science.org/apps/
just select the colorspace transform you want,with formatter OpenColorIO
and click copy to clipboard
Then Strg V paste the clipboard into the colormanagment file config.ocio from Blender
here as example i used nodepad++
Inside Blender you can select colospace transform node with from non-color and to the new transform (it does the transform from to within the OCIO you have pasted)
@troy_s do you know what is the best chromatic adapation transform to select?