Specify configuration rule to get measurements as CSS variables in rem

config.json

{
  "name": "Design Tokens / Measurements",
  "path": "./output/styles/measurements.css",
  "filter": {
    "types": [
      "measurement"
    ]
  },
  "parsers": [
    {
      "name": "sort-by",
      "options": {
        "keys": [
          "name"
        ]
      }
    },
    {
      "name": "px-to-rem",
      "options": {
        "keys": ["fontSize"]
      }
    },
    {
      "name": "to-css-custom-properties",
      "options": {
        "formatName": "kebabCase"
      }
    }
  ]
}