White balance + or - function for copy past adjustments

For Batch Processing. Please add a function where you can shift White balance by a designated + or - White Balance. rather than changing the exact kelvin or tint to a numerical figure.
the reason for this is so when you copy and paste WB adjustment settings it tells the C1 for example that you want to "add +200 kelvin" to the existing Kelvin WB.

This would be very helpful for batch processing images that have been shot in different lighting scenarios. And the Auto WB on the camera (canon EOS R5 is very good) but stylistically i would like to add more warmth to the images for example. in an even amount across the whole batch. across varies lighting.

currently the WB copy/Paste locks the Kelvin and Tint (if you have adjusted it ) or if its "left untouched" it stays on the as shot setting. which is good. but i feel this one extra feature is missing above and would be super helpful.