How to add a new option in a CRA CLI (like a custom flag)?

I am trying to pass an option (like --template flag) to React CRA CLI, as proposed in https://github.com/facebook/create-react-app/issues/9502.

That is, when we run npx create-react-app my-app --skip-git, it should create the react app without initializing a git repository.

I forked the repo and attempted to create a variable and option as --skip-git (like in angular cli, nestjs cli) in the createReactApp.js.

createReactApp.js

const program = new commander.Command(packageJson.name)
    .version(packageJson.version)
    .arguments('<project-directory>')
    .usage(`${chalk.green('<project-directory>')} [options]`)
    .action(name => {
      projectName = name;
    })
    .option('--verbose', 'print additional logs')
    .optioninfonfo', 'print environment debug info')
    .option(
      '--scripts-version <alternative-package>',
      'use a non-standard version of react-scripts'
    )
    .option(
      '--template <path-to-template>',
      'specify a template for the created project'
    )
    .option('--use-pnp')
    .option('--skip-git', 'Allow to skip git repository initialization.')

This worked locally. When I ran npx create-react-app my-app --skip-git, the createReactApp.js detected the flag and I was even able to console if the flag passed or not.

But when I try to apply changes in react-scripts/scripts/init.js, it is not reflected locally. For eg:

  let initializedGit = false;

  if (tryGitInit()) {
    initializedGit = true;
    console.log();
    console.log('Initialized a git repo.');
  }

Here I just changed 'repository' to 'repo' (verifying if the changes are reflected), but it is not reflected in my local.

How do I make changes in the init.js file and verify in local to create a PR?