From Swift to Flutter

Question

For two years I wrote an app, just for IOS, in Swift language and soon I hope I will finish it in order to be published on App Store.

However, regarding this app, I want it to be published also on Google Play Store, and recently I started learning Flutter with the current course in order to be able to write the app also in Flutter.

The problem for me is that, the app has over 300 000 lines of code and I don't think I will be able in time to manage rewriting the whole swift code in flutter, and also have the same result like in Xcode.

Is there any easier method to make the code run for android? To add some cocoa pods, or flutter modules/sdk's for example ? Or the only method is the one from above (writing the code manually) ?

Thank you!