Based on Trek's published stats then your bike has
Frame: Ultralight 700 Series OCLV Carbon, ride-tuned performance tube optimisation, E2 tapered head tube, BB90, direct mount brakes, internal cable routing, DuoTrap S compatible, Ride Tuned seatmast
Fork: Émonda full carbon, carbon E2 steerer, carbon dropouts, direct mount brakes
The only mention of dropouts is the carbon ones in the fork. There is no mention of dropouts in the frame.
Looking at your photo shows a definite grey/silvery metal which is unlikely to be steel, but definitely could be aluminium.
Carbon Fibre is not good at taking a thread, so common practice is to use an insert which is bonded into place with epoxy. Your bike probably has a metal end piece to hold the through axle and join the seat/chain stays.
I would lightly smooth off the ridges with a light sand, then clean well with IPA and dry, then apply 3-8 light coats of nail polish that match your bike.
Nail polish dries quickly, and there's a good chance you can find one that approaches the existing paint. Keep the unused polish for other future touchups.