TOKYO—Japanese prosecutors asked a Tokyo court on Wednesday to send former Nissan Motor executive Greg Kelly to prison for two years for his alleged part in helping Carlos Ghosn, the carmaker’s ousted CEO, hide earnings. Prosecutors, who are also seeking a 200 million yen ($1.8 million) fine for the Japanese carmaker, called for the jail sentence for Kelly during their closing arguments in a trial that began a year ago. A ruling in the case is expected next year, and if found guilty Kelly could join two other Americans who are serving time in Japan after a court sentenced them in July for helping smuggle Ghosn out of Japan on a private jet hidden in luggage to Lebanon at the end of 2019, where he remains as a fugitive. Japan’s conviction rate is about 99 percent. Kelly has denied charges he helped Ghosn hide 9.3 billion yen of Ghosn’s earnings …