Add a script to the News designer JSON file 
If you want to load your own JavaScript file in the default widget designer, you need to override the default designer JSON file. To do this, perform the following:
    - In your SitefinityWebApp, in folder 
Mvc/Views/, create a folder and name it News 
    - Inside the folder 
Mvc/Views/News/, create a file DesignerView.Simple.json  
    - Inside the file, paste the following markup:
    
    
 
    - Add the additional JavaScript file as a script dependency.
 
    - Save and close the file.