Right, so let me expand on this use case a little bit. If you think this should be split off into a separate feature request, let me know.
Links from one observation to another require special handling. (There are certain observation fields that already do this, such as Similar Observation Set.) A special syntax is needed so that the platform can do the Right Thing.
An example where this has already been done is Wikipedia. To link from one article to another, the name of the article is surrounded by double square brackets. Such a link works equally well on the web or mobile.