Hello and sorry for the (super) late reply! I really thought I had replied : (
Indeed and unfortunately Odin inspector attributes are not (at least yet) supported. This is basically because NodeCanvas uses a custom serialization (a heavily modified Full Serializer), and inspectors go hand-in-hand with serialization. I have tried to come up with simething, but I haven’t really yet (but I will give it another go of course)
Just to confirm, what is the actual type of the field that you want be serialized? Also is the field public, and if it is not public, have you added the [SerializeField] attribute to it please?