jwt-auth authentication with username instead email

Is there any way to use in laravel jwt-auth the authentication using username instead an email?

public function authenticate(Request $request)
{
    $credentials = $request->only('email', 'password');

    try {
        // verify the credentials and create a token for the user
        if (! $token = JWTAuth::attempt($credentials)) {
            return response()->json(['error' => 'invalid_credentials'], 401);
        }
    } catch (JWTException $e) {
        // something went wrong
        return response()->json(['error' => 'could_not_create_token'], 500);
    }

    // if no errors are encountered we can return a JWT
    return response()->json(compact('token'));
}

Something like this

$credentials = $request->only('username', 'password');

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