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I was able to pull this off with the Kindle app on my Mimas when I uncheck "Use system brightness", except that the brightness slider within the app controls the warm light, while the control within the notification pop-out ends up not being able to control the warm light, but can control the cool light, so basically, inverse of what you mentioned.
Here are a few photos to show this, with the third showing mostly cool light with some warm light, however, I had to exaggerate the mixed frontlight shot a little bit due to my phone's camera trying to compensate for the white balance, and taking photos with manual white balance ended up not coming out well.
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