All Googlebooks come with a Quick Insert key in lieu of a standalone Caps Lock button. There's bad news if you want to remap the key, though.
I turned one neglected key into shortcuts I actually use.
It’s one of the first things people new to Chromebooks notice: The Caps Lock key on the keyboard isn’t a Caps Lock key at all. On Chromebooks, Google replaced it with a Search key also known as the ...