React Native Web integration in existing React Native Application

I have existing react native app. Now I am adding web capability in that code using React Native Web.
My query is regarding the integration approach which is best to be followed.

In React native web documentation, it suggest manually creating integration approach.

Also I was going through multiple online articles , videos, they are suggesting create react app approach.
First create a react web app using CRA and then copy paste folder structure.

What is the good approach to be followed.