I wonder if there's a way to scrape that data and then send it to Home Assistant for light control.
People should really get comfortable with the idea that color is relative, so choose whatever looks nice to you and stick with it. True Tone certainly isn’t scientific.
In this scenario, all that matters is that the instrument doesn’t try to change its white balance. You can actually calculate the spectral energy of the sky based on these color changes alone, and it doesn’t matter if you start at a white balance of fluorescent or incandescent.