The guide says
The result of Nexus Sprint Planning is:
● a Nexus Sprint Goal that aligns with the Product Goal and describes the purpose that will be achieved by the Nexus during the Sprint
● a Sprint Goal for each Scrum Team that aligns with the Nexus Sprint Goal
● a single Nexus Sprint Backlog that represents the work of the Nexus toward the Nexus Sprint Goal and makes cross-team dependencies transparent