Detecting reverted background on fenix3

Pretty simple question for fenix3:

the watch allows you to invert the foreground and background colors - but... how can you detect this from a data field?

SimpleDataFields works just fine, but if you use transparent background for a complex data field you have a problem.

If it cannot be done today, I would like to request a new field in DeviceSettings like darkBackground (true/false) or similar...

/Tonny