to build a macOS function in an iOS app

looking for an iOS developer to build a function in an app that has been built with swiftUI and Core Data. The app is for user to save/manage their files and todos with attached images and attribute data stored in Core data. The function to be built is for user on their macOS platforms to export/import files/todos’ attribute data in csv file and their associated images saved in a designated folder on macOS. If you are interested in, please provide your estimate of the cost and email address so I can provide you detailed specs and github link of app xcode project/repository. Thanks for consideration