The 2021 Pro/Limiteds DRLs use halogen bulbs that are dimmed to half power by connecting the right and left bulbs in series. Each bulb gets about 6 volts and produces the yellowish low intensity glow that is desirable for the daylight DRL function. It makes the vehicle more noticeable to oncoming traffic than pure white, think amber “raptor” style lights. Any incandescent (halogen) bulb at half power will look yellow. Making them pure white would kind of defeat the purpose anyway.

The specs of the drop-in LED headlight specs that I’ve looked at show they are typically designed to operate over a range of 9-16 volts. They will not get the required voltage in a series configuration and will not even light, as others who have tried this have reported. And the typical drop-in LED headlight bulb cannot be powered by 12V and dimmed. Maybe someone makes a custom LED product that can be dimmed but I haven’t seen one.

So the short answer is no off the shelf halogen or LED will give you a dim white light for the DRLs.