Unfortunately this is not something that can just be "exposed" and then turn up in a build, sorry. It is very true, and by design, that Corona has less features for texture baking - V-Ray has always aimed to be an "everything engine" while Corona has always been focused on fully photoreal archviz with occasional product design, where texture baking is not a primary need. You could send in a Feature Request for this one, for consideration in future versions of Corona.