XF 2.2 Grab one piece of CSS Property

[Hoffi]

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.

 

[Kirby]

@xf-myTest--border-radius

 

[Hoffi]

@xf-myTest--border-radius

D' Oh. Thanks a lot.