探したらハニセレで使ってる方の解説があったのでどうぞ、使い方は一緒だと思います
http://illusionlove.livedoor.blog/archives/6826803.html
あとNodesConstraintsでもAnimationControllerで作ったシーンは読み込めるようです
https://www.patreon.com/posts/31229780
＞Note: consider using NodeConstraints by Joan6694 instead.
＞NodeConstraints does what this plugin does plus more and will load scenes that were created with AnimationController.