XF 2.2 Grab one piece of CSS Property


Well-known member
Is it possible to grab only the value form one CSS Property?
Lets say I creates a property myTest which contains easy Border Component (and more).
Now, besides the usage of the full CSS via .xf-myTest() in a Selector, I only want to grab the border-radius for another. Is that possible?
I tried .xf-myTest('border-radius') which would be really cool, but that does not work.