How to get shared_preferences in Share Extension

I want to know how to get shared_preferences in iOS share extension (swift code).

I use 'shared_preferences' to store session date in this code.

SharedPreferences.getInstance().setString("session", "session_sata")

And, I tried to get 'SharedPreferences' iOS in share extension (swift) by using UserDefaults like this code .

UserDefaults.standard.persistentDomain(forName: "") 
UserDefaults.init(suiteName: "")

However, I couldn't get session date in swift code, even more I couldn't find a key of "flutter.session".

Does anyone know how to get shared_preferences in iOS share extension?