How to Integrate Node Js Backend with Flutter

So Currently i am building a food finder app because we have got a bunch of eateries inside campus so if someone wanted some food they can basically see and compare the price of same item in different eateries and also if they wanted some food in a certain price range etc..

I am planning on integrating MongoDb and nodejs to this project in the future , right now ive got the flutter project in Android Studio , How should i proceed, i am from web background so in all my projects i had client and backend folders in the same directory , i was wondering if it is possible to do it the same way this time as well because i am not sure if i can create js files in Android Studio. Or should i just create a folder and put the backend logic inside a folder and use VSC for that , and under the same folder put the flutter project