You USED to be able to do it directly by typing [[ and searching for the alias just like any other Rem. Unfortunately, this has been broken for MONTHS and months and months. It’s really frustrating.
For now, you’ll just have to use a workaround when an alias doesn’t show up in search. The quickest way I know of is to highlight the full Rem reference in the search window that pops up and then hit Tab to navigate inside it, highlight the “Aliases” Rem and hit Tab AGAIN to navigate inside of THAT one, and then, finally, choose the desired alias to insert. Alternatively, you can insert the full Rem reference first and then click it, select “Edit Reference Text (Add Alias),” and choose the desired alias from the list.