Hi

I'm looking to add a attribute to only variable in a product in woocommerce
For example:
Product is a T-shirt which I have variable sizes. I need to add a attribute that will show only with one specific sizes. Let's say XS.
T-shirt , size XS has to have a option that you can choose the Color Red, no other sizes will have that option.

I tried but if I add the color option it shows on all sizes instead of only one.

Anyone with an idea ?
I appreciate any help.