Cabin crew time is not a substitute for pilot flying hours. No airline which demands several thousand flying hours (ie pilot experience) from its applicants will waive that requirement because you are cabin crew.
The only airlines that will recruit from the ranks of CC are those which have an established cadet scheme and a training structure that goes from zero flight time to jet RHS. Virgin is certainly not one of those. Emirates might be - but almost certainly only for UAE nationals. To qualify, you'd have to meet the nationality and age stipulations of the course, as well as pass all the relevant selection procedures.
The other route you might consider (which has been used in many airlines, though not at Virgin) is effectively taking an extended leave of absence from your company while you go and get trained and build up to the company's required experience level - which may take a good few years. You may then be invited to rejoin the company as a pilot if you're lucky. It's a long shot, but it might work.
Scroggs