Maybe it's just my preference, but I think a JSON/YAML replacement should focus on removing as much redundancy as possible. For example use

    title: SAN Example

instead of

    title = "SAN Example"

and use dictionaries by default, that is

    creator
    
      name:    Sylvain Kerkour
    
      website: https://kerkour.com
    

instead of

    creator = {
    
      name = "Sylvain Kerkour"
    
      website = "https://kerkour.com"
    
    }

or something like that more or less...