If you want create a ray at a certain angle all you need to be familiar with is cos and sin and apply it.
So speaking from a topdown view having the ray at an angle of 45 degrees would be simply X vector set to cos(45) and Y vector to sin(45).
Viewing post in Rays hit angle
Just to be clear: you want to get the yaw, pitch and roll of a hit face? What's the use case if I may ask?
Afaik you could use a bit of math and get yaw and pitch of the face from the normalized normal. However the normal from the ray hit is being used internally, it's not exposed via expressions or anything currently.
Maybe such expressions could be useful.