defaultVisible property
If true, then this socket is visible in the item's "default" state. If you have an instance, you should always check the runtime state, as that can override this visibility setting: but if you're looking at the item on a conceptual level, this property can be useful for hiding data such as legacy sockets - which remain defined on items for infrastructure purposes, but can be confusing for users to see.
Implementation
@JsonKey(name:'defaultVisible')
bool? defaultVisible;