Is it possible to have nested enum in Typescript?

Having those enums:

export enum First {
  TEST_1 = 'test_1',
  TEST_2 = 'test_2'
}

export enum Second {
  TEST_3 = 'test_3',
  TEST_4 = 'test_4'
}

is it possible to combine them into a single one?

Something like:

export enum Main {
  First {
    TEST_1 = 'test_1',
    TEST_2 = 'test_2'
  },
  Second {
    TEST_3 = 'test_3',
    TEST_4 = 'test_4'
  }
}