Component OnAwake or OnEnable with PropertyAttribute

I'm trying to create helper attribute, that'll check specific field is set in inspector (or maybe there is some solution already?) For instance, default check for "Not null":

 [AssertField]
 [SerializeField]
 private GameObject _prefabReference;

And I need to detect "Awake()" of this component from PropertyAttribute or PropertyDrawer and do something like this:

 Awake() {
     Assert.IsNotNull(_referencedField, 
         "Field of type " + typeof(_referencedField).Name + " is null");
 }

For now I'm use assertions in Awake, but sometimes it's hard to track all fields I need: