Do I need to declare Gaoyou back to Yangzhou?

No need.

People who travel to and from low-risk areas in the province need to have normal body temperature. The green code of "health code" and "travel code" do not indicate the information of staying history in medium and high risk areas, so personal protection can be done and the flow can be orderly. (The specific implementation is subject to the community. It is recommended to call the local community or village Committee in advance).