I can't find or there isn't a 'copy' Tones feature in the Lightroom ecosystem (Cloud-based).
I've been trying to correct skin tones, but in the Lightroom ecosystem (Cloud-based), RGB curves can only be used separately, without the possibility of using a reference image.
I would like to use a dropper tool on an image, copy the RGB values, and easily insert them into another image. We can do this easily in LrC or Photoshop, but in the Lightroom ecosystem (Cloud-based), RGB values are not displayed below the histogram."
The best I can do is venture into the comparison view (Alt + C) and try to visually guess the best RGB values to match.
So that you understand me, here are examples: