@devoinc/genesys-tokens/dist/tokens/component/layout/Modal/modal__backdrop.json

Design tokens generator

{
  "cmp": {
    "modal": {
      "backdrop": {
        "elevation": {
          "zIndex": {
            "base": {
              "value": "{alias.elevation.zIndex.depth.overlay.value}"
            }
          }
        }
      }
    }
  }
}