How to build APK from react native project using node express

I am aware about building apk with expo for react native only but I am on a project which uses express node Js to get data and show in React native. How to build apk for this project ?? Moreover do I have to use Mongodb as currently everything is on localhost and this may not work on production.P.s. I am not familiar with express, node, mongodb. Just saw some video to get my work done.Below code is the part of express node file

var a = gsrun(client)app.get("/", async function (req, res) {  res.send(await a)})const PORT = 8080;app.listen(PORT, function () {  console.log("hello world")})

This is the part of react native, used to connect to node

connect = () => {  const URL = "http://192.168.43.240:8080";  fetch(URL).then(response => response.json())    .then(response => {      console.log(response);      setDoList(response)    }).catch(error => {      Alert.alert(error.message);    }    );}

Please guide me and show the correct path.