While we have Markdown linkification that resolves
[](path)
links, these are just turned into plain <a> tags. Gitbook allows the {% page-ref page="./path.md" %} syntax, which produces a nice standalone link, displaying the permalink and the target page title.
We can probably expose a linkify API that takes a Markdown path and returns a page's metadata, containing permalink, title, etc., maybe even an OOTB standalone link component. Don't know how non-trivial it would be to implement such a feature, and it would probably require reaching deep into the current infrastructure.