That's available. ADS-B receive only in a 6 gram package. A full ADS-B transponder in a 20 gram package.[1] Now your drone is visible to ATC and aircraft, and in turn, can see other aircraft, in areas where there's ground radar.
This is more for commercial operations in class B airspace, where you need to get permission from the controlling FAA tower. Real estate photography in a city or shooting a movie, for example.
This doesn't help with avoiding stationary objects; that's a separate problem and requires sensors. ADS-B just tells all the players in controlled airspace where the other players are.