XML files for competition-specific kits

Hey folks! If I have a kit I want to use just for the Champions League (like Barcelona or Dortmund), how would I go about setting it up in the XML file? I've created the IG assets using the IG editor and used FM Kit Creator for the kit itself which has provided me with a default XML for a home kit, but I don't know how I should modify it for it to be doing what I want it to. Thanks in advance!

I don't believe it's possible.