How to call Javascript from Unity without .jslib ?

My index.html page includes analytics.js that is hosted remotely. It has a javascript function

StringReturnValueFunction()

How do I call this function from Unity? The following code doesn't work because analytics.js in not a .jslib plugin:

Code (csharp):

1.  
2.   public class A : MonoBehaviour {
3.     [DllImport ("__Internal")]
4.     private static extern string StringReturnValueFunction ();
5.  
6.     //////////////////////////////////////////////
7.     void Start() {
8.       Debug.Log (StringReturnValueFunction ());
9.     }
10.   }
11.  

 

I don't think you can anymore. In the past you could have just called Application.ExternalCall or ExternalEval, but all of that is now marked as insecure and won't work on production games.

You have to use a jslib plugin

 

Well, I can of course write jslib middleware, but I was hoping there is a direct way.

 

pearhaps UnityWebRequest.
i use this to run php-scripts.