https://www.reuters.com/article/us-dingdong-ipo/softbank-backed-dingdong-targets-over-6-billion-valuation-in-u-s-ipo-idUSKCN2DY2HS >(Reuters) -Chinese unicorn Dingdong, backed by SoftBank's first Vision Fund, is aiming for over $6 billion valuation in its New York debut as the online grocer joins Asian tech startups seeking to tap into the IPO boom in the United States.