Here is a bunch of overexposed shots, including of a colorchecker passport from slightly overexposed, through to OMG I forgot I was in manual mode, in 1/3rd increments.
xyY, Lab and RGB values in various color spaces of the color checker can be found in
this PDF (page 5 ColorChecker 2005). I've done my best to limit the UV exposure to the color checker, but it is around 2 years old now, so the values may not be 100% accurate. You can WB from the neutral 5 patch (top row 3rd from left).
I've also included a LR template* I created based on the colorchecker. It provides HSL adjustments only, WB/Luminance adjustments are left for each exposure. It was created some time ago and won't be 100% accurate for the shots I've uploaded. Note also that LR only provides RGB in percentage values, ACR is better for accurately checking level values.
To get an idea of the changes it makes.


I've got a Canon picture style floating around here somewhere based on the colorchecker also if you're interested.
*In development pane, in preset section on left, right click, import.