In previous versions of Flash, you could create a JSFL file that created a new Flash project by using
var myNewDocument = fl.createDocument();
In Animate CC, there appears to be a new an (or animate) object that also allows you to call createDocument, but there appears to be no way to create an HTML 5 canvas with this function.
Well, nobody seemed to have the answer here but in case somebody else comes looking for an answer it's:
I've confirmed that this works in CC 2015.2.