index.tokens.json should output design tokens JSON format with "value" property

[Robbert]

this is an issue with @utrecht/design-tokens/dist/index.tokens.json

I don't know, maybe choose different settings for style-dictionary.config.js

{
"files": [
        {
          "destination": "index.tokens.json",
          "format": "json"
        },
        {
          "destination": "index.nested.json",
          "format": "json/nested"
        },
        {
          "destination": "index.flat.json",
          "format": "json/flat"
        }
      ]
}```