They should be rear markers which are red. Front markers are yellow. Many cars, including my Chevy Equinox, turn them on with the DRL. Federal law mandates them, but there is no limit on how many or where to put them, as long as they face rearward. I added one as the hitch cover.
Most modern cars now use LED markers. I replace all the lights (interior and exterior) in my Equinox with LEDs , which is now 100% LED (including the twin beam headlights), and they will last the life of the Equinox (at least ten more years). I suspect that the Chevy Bolt EV markers are also LEDs.