It would only be as complicated as the name you pick for the outlet. If you were to name it “Nightstand light”, for example, the command would be as simple as “Alexa, turn off the nightstand light”. Not sure what would make it more complicated than that, unless you’re using the Ask Alexa smartapp, which is not necessary to just turn things on and off.
Regarding CoRE, this is the post, he just said he made one and it was working, didn’t give an example.