Hello
I am a macOS system developer and I can help you with the notarization.
I can also create a script for you that notarizes the app with all its included frameworks and the .pkg installer, provided that you have: I have done this for my own projects.
Depending on the project, some modifications to the project file may be needed to enable notarization, to satisfy the notarization requirements (like, enabling hardened runtime, and others)
Can I have a look at your project and the build process you have?