JAKARTA — Asia is home to more than half the world’s most dynamic retail hubs, according to new research that reinforces images of the region’s mall-strewn megacities. The research, by professional services and investment management company JLL, says 12 of the fastest-growing retail cities are in Asia, with eight in China alone — another indication that global economic growth is increasingly driven by the Asia-Pacific region. JLL lists Dubai as the world’s fastest-growing retail destination, with Shanghai second and Beijing third. Places 9 to 13 are occupied by Bangkok, Chengdu, Kuala Lumpur, Jakarta and Manila, respectively. Only two European cities make the top 20 — Moscow and Istanbul — with none from Africa. Mexico City is the sole city from the western hemisphere, sitting at number 19.