How to send notifications only to those subscribers who are subscribed to the section that we just updated?

Question

WordPress

I have a site with subscriptions to articles. 10 articles and 10 subscriptions for each. Articles are updated 2 times a day. It is necessary to make sure that notifications about updating articles come only to those who subscribe to them.
Those. the person is subscribed to 3 articles, and he should receive notifications about updating only these articles.
articles = posts in WP.
I use plugins for selling subscriptions and separating users into subscriptions
WooCommerce Memberships WooCommerce
subscriptions