Just wanted to chime in and say this is a feature I would also appreciate. Dragging in an alias doesn't work; it just opens the alias in Textedit for some reason.
My details, in case it matters:
Evernote v 10.5.7 build 2171 public
Editor: v114.1.14753
Service: v1.25.2
macOS Mojave 10.14.6