In unreal right now they only replicate pitch for client in Pawn, and you can only get that through C++ only. They replicate by taking value from Controller rotation from server, because only server and owner client have controller, which indicate where you look.
So here you need to get controller rotation, then get pitch and yaw from there and save to some replicate value for client to see.
Btw, must be weekend so no one there to answer.