I want to make a PWA that daily checks whether new posts are available, and give notification if there is. The problem is the blog is .blogspot.com which means I can’t host javascript or manifest files on the domain. I need to host the app on another domain, and ask the user to install the app from there. According to this article, periodic sync won’t be fired if user engagement is zero on the website, which will be the case since the reader isn’t spending any time on the website hosting the PWA, and is spending time reading on my blog instead. So is there any way to refresh the site engagement on the website hosting the PWA while the user is reading on my blog?