Follow these steps:

1. Open your Interface Editor
   
2. Create a new text element
   
3. Click on "Src" to change the text source
   
4. Choose the file type (RSS, XML of JSON)
   
5. Input the URL of the RSS/XML/JSON file (in this example, it is a local file). You may Parse, in order to valideate if the file is currently online and reachable.
   
6. Change the text content to be according to the attribute/element name to be displayed between double brackets, such as {{plate}} in this example.
   
7. Test playback your template!

Download the example JSON file and Designer .ar file here.