Thanks for your comment, i used to use Native Modules with react native cli and i can find ios and android folders inside the generated project structure.
I also used react-native eject command and generated the required folders but without any configuration so i cannot run/build it correctly in android studio.
I tried to use mendix native template but when i tried to run npm run configure command i get an issue related to missing config file.
I dont have a direct answer but since i know(i have read and see in the plugin code) the architecture is around the react-native components you have to think from that side.
That is, how would you write native code in react-native. When you explore on this, you will encounter Native Modules Its like a bridge between the Javascript Land to the Native land.
To explore more perhaps you can check the widget scripts for native