this has also been requested on our GitHub. The short answer is; there is no easy shortcut to do this today. Of course it /is/ possible, it is Nyxt after all, but it is non-trivial.
Your request brings to mind a slightly different variation: I would like to approach this from a generalized perspective. How can we make this work, this auto-follow, for ANY command. For example, we could say “if the match is 95% or more certain to be correct, automatically press return”. Or, we could say, “if the user doesn’t type something for 3 seconds, automatically press return”. So, you could use this approach to switch buffers, delete buffers, add bookmarks, etc. We don’t need to limit ourselves to link hints!
What do you think?