How to add other variables in the API response?

Hello, when I make a request the response carries this information:

{
    "token": "example_token",
    "user_email": "[email protected]",
    "user_nicename": "example-pw",
    "user_display_name": "example-user",
}

I need to add user_id as a variable included in the response, I have edited in this file public/class-jwt-auth-public.php and in the line num #196 I have edited this code:

/** The token is signed, now create the object with no sensible user data to the client*/
		$data = [
			'token'             => $token,
			'user_email'        => $user->data->user_email,
			'user_nicename'     => $user->data->user_nicename,
			'user_display_name' => $user->data->display_name,
		];

to this code:

/** The token is signed, now create the object with no sensible user data to the client*/
		$data = [
			'token'             => $token,
			'user_email'        => $user->data->user_email,
			'user_nicename'     => $user->data->user_nicename,
			'user_display_name' => $user->data->display_name,
			'user_id' => $user->data->user_id,
			'userId' => $user->data->id,
		];

I have tried $user->data->user_id and $user->data->id but the code didn’t work the response back NULL in the user_id and userId

this is the response:

{
    "token": "example_token",
    "user_email": "[email protected]",
    "user_nicename": "example-pw",
    "user_display_name": "example-user",
    "user_id": null,
    "userId": null,
}

Any help please?