Allegedly, they have the LEDs in them to blink yellow, 100% confirmation would require someone with a US vehicle (or access to a dealer parts catalog) to compare part numbers... Activation of this would require recoding in the BCM.
Assuming this is similar to the other European manufacturers, expect it to be 1-2 years before someone figures out an end-user software tool and the required coding changes... Perhaps if enough of us push for it
Kufatec will start producing dongles to reprogram the required settings on the Grenadier for all sorts of stuff. They have been making VW/Audi recoding/programming devices for probably 20 years and I have used a plethora of their devices to recode and enhance stuff on the Sprinter (5 blink turn signal, different boot logo on the infotainment, DEF range, folding mirrors with lock/unlock, ignition-persistent lane keep assist status, etc)