I couldn't find this detail in the current spec: Do we consider the root node of a token tree a standard group?
Said differently, can I have $description and/or $extensions at the root level? 👇

{
  "$description": "Tokens from brand A",
  "color": {
    "$type": "color",
    "$value": "#ff0000"
  }
}

It seems giving the root node the group definition opens opportunity to store global metadata. But becomes harder to work with, anytime there're more than 1 tokens file to handle.

Is there a decision about this already?