Variable Scope "FONT_VARIATIONS"

When I export our Design System with the Sync Github Tokens script it gives out a scope called “FONT_VARIATIONS”.

But this is nowhere mentioned in the VariableScope Plugin API and therefore i cant import it again.

Any clues about this?

"body": {
      "full_width": {
        "content": {
          "grid": {
            "columns": {
              "$type": "number",
              "$value": 12,
              "$description": "",
              "$extensions": {
                "com.figma": {
                  "hiddenFromPublishing": true,
                  "scopes": [
                    "WIDTH_HEIGHT",
                    "GAP",
                    "FONT_VARIATIONS"
                  ],
                  "codeSyntax": {}
                }
              }
            },

this is the mentioned Sync Github Tokens Script: