Where to store reference to objects?

Unity Engine
,
1

I have a ComponentSystem that wants to perform raycast from camera.
I don’t want to use Camera.main inside OnUpdate. I want to cache the camera somewhere and use that.
So what’s the best way to do it? Should I use SystemStateComponent?

2 
 public class MyCameraSystem : ComponentSystem
    {
      Camera camera;
        protected override void OnCreateManager()
        {
            camera = Camera.main; // reference here
        }
      

        protected override void OnUpdate( )
        {
          // use camera here
         }
   }
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