$Bridgetown Holdings Limited(BTWN)$merge with grab??? Grab Holdings Inc. is exploring going public in the US through a merger with a blank-check company as the Southeast Asian ride-hailing and delivery giant seeks to expedite its listing process, according to people familiar with the matter.JPMorgan Chase & Co. and Morgan Stanley, which are already advising Grab on its initial public offering plans, are working with the startup to identify special purpose acquisition companies that it could combine with, the people said. Still, a US listing via a traditional IPO isn’t off the table, said the people, who asked not to be identified as the discussions are private.Representatives for Grab and JPMorgan declined to comment, while a representative