Traffic lights for actual key on CDJs and XDJs

Context: on Rekordbox, traffic light shows which tracks will mix harmonically with the actual, current key of the master track, rather than the original one (whether the shift comes from a tempo adjustment without Master Tempo on, or through Key Sync or Key Shift)

It would be great to implement the same thing on CDJs and XDJs, esp the more recent models (CDJ-3000, XDJ-XZ, XDJ-RX3), where it's probably possible if the developers are still willing to perfect those products.