Where is that selected text? You can link any text inside a Long Text (Rich Formating enabled) to any URL, including one that opens a Record. But that is manually done and I think maybe there is a better way to accomplish what you want to do.
The text(s) occur in different places in the Long Text field. I figured out I could link by URL, but I wasn’t sure if that was the right way (and if it would work within, say, the iOS app too.
