I'm using Safari 13.0.1 on macOS Mojave 10.14.6. I can add the current web site to the reading list by pushing the sharing button and then selecting Add to Reading List.
Now I want to that without opening the page first. So the context menu of a link in Safari has a Share menu entry, but there's no Add to Reading List in its options. In System Preferences - Extensions - Share Menu, Add to Reading List is enabled. But it still doesn't show in a link's Share context menu. I disabled and enabled Add to Reading List to no avail — other entries in there immediately hid and reappeared in a link's Share context menu when unchecking/checking them here.
So, can I get Add to Reading List into a link's Share context menu in Safari? If so, how?