I’m currently having trouble understanding how i can allow users to take screenshots of the whole page on iOS – because in some apps (Safari, ..) it’s possible to take such a screenshot and well i thought it could be a feature that is only available to apple itself, but now i’ve seen the chatgpt app also allows this

I am using expo with react native to build an IOS app.
Now I want to change the details in app.json file according the the university id of my project which i have stored in .env file. For this I am using the app.config.js file.
But I am not to able to figure out how to make it implement. Can someone provide me some code and command reference