problem description

react uses create-react-app to build the environment
node intends to use the Express framework

Q: want to know how to structure the project if you use node to develop the backend?
Q: do you want to open two services if you run it? -yarn start, node XXX.js

Project structure (create-react-app)

I hope that some passing bosses can help solve the doubts. I am very grateful to QAQ