Changing Lap Counter Text Color with Flags

I know this is possible with scripting I just don't know how. Basically I want the lap counter to change from white to black on Yellow and White flags and vice versa. Thanks for the help!

(https://atvo.appgineering.com/Forum/Thread/316?postId=2376#2376)

In this exemple we change color with override fonction and script.

Perhaps a script executed when event trigger of each flag to override the font color .....