TestNg - How to merge two dataproviders horizontally

Can you please let me know if we can merge the below 2 dataproviders

public Object[][] dp1() {
   User user = new User(1L, "Arun");
   Transaction trx = new Transaction(1L, "atm");   
  return new Object[][] {
      new Object[] { user , trx, true  }

  };
}

public Object[][] dp2() {
  return new Object[][] {
      new Object[] { "e", "f" }
  };
}

I want to merge them horizontally, after merge the following output is desired in the merged dataprovider { user , trx, true, "e", "f" }