Maintaining Ink story state across Unity scenes

If I want to maintain the current Ink story state when moving across multiple Unity scenes, should I do a kind of autosave before leaving one scene (eg "string currentInkState = _inkStory.state.ToJson();") and then, after entering the new Unity scene, create a new inkStory ("inkStory = new Story(inkAsset.text);"), and then load the autosave into it ("_inkStory.state.LoadJson(currentInkState);") ? And do this with each Unity scene change?

Or would making the Unity scene object that manages the Ink state a singleton make that unnecessary?

What's the best practice? Thanks!