How can I access the web view inside the native app?

I want to access the webview element within the native app element.

But I don’t know how to access it in the native app without using a browser.

How can I access elements in a web view?

For your information, the app I’m trying to test is not the one I made but the one I downloaded from the store.

release version of app in most cases have webView closed for debug and thus for access.