Alibaba Group Holding Ltd. Chairman Jack Ma met with Donald Trump on Monday to discuss how the online retailer could help create 1 million new U.S. jobs, keying in on one of the president-elect’s chief concerns amid fraught relations between China and the incoming administration. The Chinese e-commerce giant said the positions would be generated through Alibaba adding 1 million small and medium-sized U.S. businesses to its platforms, estimating that each one will hire a new person as a result of the added commerce.