Here "Jews" is a synecdoche for the Jewish leaders who opposed Jesus. AT: "for fear of the Jewish leaders" (See: [[rc://en/ta/man/translate/figs-synecdoche]])
John implies that Joseph of Arimathea wants to bury the body of Jesus. AT: "for permission to take the body of Jesus down from the cross for burial" (See: [[rc://en/ta/man/translate/figs-explicit]])
You may convert this to a modern measure. A "litra" is about one third of a kilogram. AT: "about 33 kilograms in weight" or "weighing about thirty-three kilograms" (See: [[rc://en/ta/man/translate/translate-bweight]])