Is there a way to publish a Combine event from a CoreData NSManagedObject? Naturally it can’t be done with a @Published var since extensions can’t contain vars. Thank you

extension MyCoreDataObject {
    @Published var relevantValueChanged = 0 // This is not allowed
    override public func willChangeValue(forKey key: String) {
        if key == "relevantValue" {
           relevantValueChanged += 1
        }
        super.willChangeValue(forKey: key)
    }
}