Lemmy app on iOS using PWA

I recently started using Lemmy as an alternative to Reddit and there is one major inconvenience that makes it difficult to use. Specifically, there are no iPhone apps that support it (yet?). So instead, I am using it as a web app by adding it to my Home Screen. It works well for the most part, but there are no navigation buttons to allow me to go back and forth between pages. So I might find myself diving deep into a thread, but when I want to go back up a level, I can’t. Instead I’ve been tapping the instances icon at the top to get back to the home page. Then I have to go find where I was at again. Plus, there are no tab options that I could use as a workaround. Is there any way to pop up arrow keys or map them to one of the volume buttons? Is this something that needs to be added into the Lemmy software? Are there any known apps that support Lemmy in development?