Best way to implement Flask Backend with Cross Platform GUI?

I'm having a hard time trying to find a way to implement Electron with Flask without creating a 2nd server to handle Flask. With little resources about this topic the best tutorial I found is: https://www.techiediaries.com/flask-electron-tutorial/ but it seems to run 2 servers having Electron handling Flask as if it weren't apart of the application when it is the main app. Not sure if this is appropriate for an OS app. Also people have complained in the discussion of the tutorial about packaging the app and the Python portion not showing up. Any ideas for accomplishing a native OS app thats cross platform similar to Electron? Or how to do this in Electron w/Flask..?