Redirect Mocha outputs to Bunyan to be JSON formatted in VS Code terminal

Question

{
    "type": "node",
    "request": "launch",
    "name": "Mocha Current File with Bunyan",
    "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
    "args": [
        "--require",
        "bunyan",
        "--timeout",
        "999999",
        "--colors",
        "${file}"
    ],
    "console": "integratedTerminal",
    "internalConsoleOptions": "neverOpen",
    "protocol": "inspector",
    "skipFiles": [
        "<node_internals>/**",
        "**/node_modules/**"
    ],
    "runtimeArgs": [
        "--preserve-symlinks"
    ],
    "env": {
        "DEBUG": "nock.*",
        "LOG_LEVEL": "debug"
    }
}

I am trying to log logs to the terminal in a JSON formatted way. That's why I am trying to redirect Mocha outputs to Bunyan. I have this config file, but I am not sure how to set it up.

How can I achieve this?