Webgl javascript interop: return object

I'm trying to setup a communications layer between my Webgl unity build and javascript on the page that contains it. I've followed the instructions on

https://docs.unity3d.com/Manual/webgl-interactingwithbrowserscripting.html

and that works. However, what I want to do is call a js function on my page that returns a (js) object and serialize that into C#. Sorta like this:

(javscript)

Code (JavaScript):

1. function gameLoaded() {
2.    return {
3.       progress: 3,
4.       mistakes: 5
5.    }
6. }

(c#)

Code (CSharp):

1. [Serializable]
2. struct GameData {
3.   public int progress;
4.   public int mistakes;
5. }
6.  
7. [DllImport("__Internal")]
8. private static extern GameData GameLoaded();
9.  
10. public Start() {
11.    GameData data = GameLoaded();
12.    print(data.progress); // should print '3'
13. }

(javscript)

Code (JavaScript):

1. (.jslib)
2. mergeInto(LibraryManager.library, {
3.   GameLoaded: function() {
4.     return window.gameLoaded()
5.   }
6. }

How would I go about doing this?

 

Okay I figured something out. On the js side I call `JSON.stringify(object)` and then in C# I take that string and run it through JsonUtility.FromJson<GameData>(result);

Great success.

 

still the best option.