Local Notification without unity libraries

Hi, I have a socket connection system that keeps working on background even if the unity application is on pause due to lose focus. I am trying now to figure out how to raise a notification from the socket receiver. I tried some notification plugins but all them use the unityeditor someway and the notification fails because cannot be run outside the main unity thread and the main is on pause. So someone knows a way to raise a local notification using C# code and avoiding unity libraries to raise it while the app is on pause? I was thinking about java library compiled to dll or something similar.