C++ Print ASCII symbols (specifically greek symbols) to a notepad file & terminal window

Question

I'm trying to print ASCII greek symbols to a notepad file and the terminal window. From what if seen, this appears to be pretty complex. Is there a simple way to approach this? Possibly a prewritten library I can use? Does Microsoft have anything readily available to use?

Right now, the symbol simply prints as a question mark. My code and system information is provided below.

Compiler: Visual Studio 2019 OS: Windows 10

CODE:

#include <iostream>
#include <fstream>
using namespace std;

int main() {
    
    cout << "φ" << endl;
    system("pause");

    ofstream out;
    out.open("test.txt");
    out << "φ" << endl;
    out.close();

    return 0;
}