Novel Reading App

I need an online and offline reading app look like web novel or novel full with flutter or Xamarin. Just need complete UI.Sample data should be setup via offline json and ready to prepare to connect with backend UI. It should be support offline data caching and reloading from backend api. No need to create authentication and CRUD. Just need UI.
App should look like following app.
https://apps.apple.com/us/app/novelfull-read-novel-offline/id1437708163