inConfig.js

const config = {
  "e02c2064-d961-4feb-lll4-558e0dd596d1": {
    user: {
      name: "Ian",
    },
  },
  "f662b7aa-e2ff-4406-97c3-c0c6cb511159": {
    user: {
      name: "Greg",
    },
  },

  "ce0699ad-3578-47d6-837c-2aaad02f4b4a": {
    user: {
      name: "Sandra",
    },
  },
};

function inConfig(inConfigKey) {
  return new (class {
    valueOf() {
      return inConfigKey;
    }

    toString() {
      return inConfigKey;
    }

    get name() {
      return config[this.toString()].user.name;
    }
  })();
}

const key = inConfig("e02c2064-d961-4feb-b8e4-558e0dd596d1");
console.log("Key: %s", key);
console.log("Name: %s", key.name);