[Flutter] How to modify plugins Dart code Flutter?

I am developing a Flutter app, and it uses map_view plugin. I want to add new functionalities to the plugin by modifying the source code. How do I find the actual source code of the plugin in my project after installing it through Flutter?

How plugin is added in Flutter

The dependency for map_view plugin is added to pubspec.yaml as below, then running flutter packages get will add it to the project. dev_dependecies: map_view:

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