Reply To: Long page loading due to Youtube/ Долгая загрузка страниц из-за Youtube

Yes, sorry, this option exists in Elementor only. WPBakery page builder doesn’t have such ability.
You can also try to use WP Rocket. It has a lazy loading option for iframes and videos https://gyazo.com/1adfc228d13356c5965d997b2bd15ac4