Will Allah ask a man before entering Paradise, "What do you desire?" So if he requests to marry a specific woman who did not marry in this world, will Allah marry her to him, and does the same apply to a woman?

There is no evidence from the divine texts that confirms or denies specific details regarding marriage in Paradise. However, it is certain that whoever enters Paradise will attain everything they desire and wish for, as Allah Almighty says: "They will have there what they wish, and with Us is more." There is no impediment for this bliss to include a man marrying the one he loved in this world, if she enters Paradise and did not marry, and similarly for a woman. Everyone who enters Paradise will marry, and they will only marry the one they love. A woman in Paradise will be with her last husband, or with the one among them who had the best character, if she married more than once in this world and they all entered Paradise with her.