Broadcast Overlay - Does anyone know how to edit it?

I'm trying to add some different classes for the overlay in the config.json, but doesn't seem to change or update it. Studio S397's page on the User's Guide is doesn't explain it very well or show how this works. Any thoughts or better resources?
 

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How are you going to watch 24 hours of Le Mans

  • On national tv

    Votes: 39 33.1%
  • Eurosport app/website

    Votes: 36 30.5%
  • WEC app/website

    Votes: 18 15.3%
  • Watch party

    Votes: 10 8.5%
  • At a friends house

    Votes: 1 0.8%
  • At Le Mans

    Votes: 14 11.9%
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