It means that the word is ironic. Great East Asian Jihad was a slogan of Japan during World War II, aiming at defending the war of aggression. Therefore, quotation marks can emphasize the irony of this word and make people understand the essence and purpose of this slogan more clearly. The slogan of the Great East Asian Jihad is widely regarded as hypocrisy and lies, because the declared "jihad" is actually a cruel war of aggression.