Get key from AssetReference

Hello,

I'm currently pre loading and instantiating all my assets at the begin of my game, and I store them in a Dictionary.

Code (CSharp):

1.         private static void OnFactoryLoadedCompleted(AsyncOperationHandle<IList<IResourceLocation>> obj)
2.         {
3.             if (obj.Status == AsyncOperationStatus.Succeeded)
4.             {
5.                 if (obj.Result != null)
6.                 {
7.                     foreach (var result in obj.Result)
8.                     {
9.                         Addressables.LoadAssetAsync<Object>(result).Completed += o =>
10.                         {
11.                             store.Add(result.PrimaryKey, o.Result);
12.                         };
13.                     }
14.                 }
15.                 isLoaded = true;
16.             }
17.         }

I have AssetReferences on ScriptableObject that I want to instantiate.
But AssetReference doens't hold the key to the Object, only the GUID.
I need to use the key because I'm saving my game entities based on the key.
I don't want to use the GUID to do so if I want to replace an object later with another one I can't force unity to regenerate the same GUID (or at least it will be more complicated)

Any solution ?

Thanks