[LLDB] lldb-mi debugger not able to take input file as an exe argument

Hi, I am trying to debug a program which takes a input file. It works in command line when I run it as ./a.out <testinput.txt and when I try to debug it I get the following output and debugger hangs as if it doesnot get any input.

Launching: '/Users/wge/Github/CSE340cpp/Pj3/a.out'
Working directory: '/Users/wge/Github/CSE340cpp/Pj3'
2 arguments:
argv[0] = '/Users/wge/Github/CSE340cpp/Pj3/a.out'
argv[1] = '<testa8t.txt'

I did try put < and testfile.txt in two arguments with no difference.
I set the external console to be true but it doesn't seem like there is a way for cpp debugger to accept a input like regular command line would?
I am using vscode 1.17 and lastest cpp extension with lldb on Mac OSX.

{
"version": "0.2.0",
"configurations": [
{
"name": "(lldb) Launch",
"type": "cppdbg",
"request": "launch",
"program": "${workspaceRoot}/a.out",
"args": ["<testa8t.txt"],
"stopAtEntry": false,
"cwd": "${workspaceRoot}",
"environment": [],
"externalConsole": true,
"osx": {
"MIMode": "lldb"
}
}
]
}

Beginne damit, die gemeldete launch.json-Konfiguration unter macOS mit LLDB zu reproduzieren, wobei der Schwerpunkt auf den Einstellungen args und externalConsole liegt. Bestätige, ob die stdin-Umleitung aus der Eingabedatei an das zu debuggende Programm übergeben wird; abgeschlossen ist die Aufgabe, wenn das Programm die Dateieingabe akzeptiert, während es über den C/C++-Debugger gestartet wird.