This question is in reference to Atlassian Documentation: Anchors
Once the system knows what page is being linked to, it should also know what anchors are available for that page and be able to provide a selector.
No, that functionality is not included in Confluence, and Yes, it would be very useful.
There are no anchor addons in the Atlassian Marketplace, and I can't find any bug/feature requests for this functionality at jira.atlassian.com. But if you search for "anchor" amongst the bug/feature requests you'll find a lot of annoyed customers complaining about how user-unfriendly anchors are. If you put a feature request in for this functionality you'd probably get quite a bit of support.
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