How to add your email to multiple newsletter lists

wppopups-lists.php

<?php
/**
 * Plugin Name: WP Popups newsletter lists
 * Plugin URI:  https://wppopups.com
 * Description: Beginner friendly WordPress popup builder plugin.
 * Author:      timersys
 * Author URI:  https://wppopups.com
 * Version:     1.0.0
*/
add_filter( 'wppopups/newsletter/subscribe_data', function($data) {
  $data['list_AAA'] = 1;
  $data['list_BBB'] = 1;
  return $data;
});