How did you figure out how to do this?

[ktprograms]

Did you find any other documentation than just this and same for the other classes? (This from https://developer.apple.com/documentation/virtualization/vzmacosinstaller)

class VZMacOSInstaller : NSObject
init(virtualMachine: VZVirtualMachine, restoringFromImageAt: URL)
var progress: Progress
var restoreImageURL: URL
var virtualMachine: VZVirtualMachine
func install(completionHandler: (Result<Void, Error>) -> Void)