The fighters can actually receive the radar information from AWACs, so the pilots see the radar image. However, just like not having total CAPs coverage over the US, there's not a lot of AWACs coverage either. I'd be shocked if there's any mechanism for them receiving civilian ATC radar. To that end, how much radar coverage is actually there? Isn't civilian traffic pretty much IDs broadcast from the planes?
Civilian air traffic control relies mainly on secondary surveillance radar including aircraft transponders, plus ADS-B. Primary radar coverage is limited to larger airports plus a few border and military areas. An aircraft can hide pretty effectively in most US airspace by just flying low with transponders switched off.
