Indian it is! :) But seriously, I guess you already know but Chaos Group as a very decent viewport preview of volumetrics using the vrayvolumegrid object. It would save a lot of work and generate compatibility if Corona would be able to just pick up those vrayvolumegrid objects and render them.
(Funny enough I was already using vrayproxy objects in Corona which work fine when you put an 'convertToPoly' modifier on them)