For iOS app automation utilizing Appium, is a Debug IPA file a should?

Assumption:

1. No Supply Code
2. No .app file
3. Even no Debug IPA supplied
   The app is Hybrid (Native app and (in-app browser) Webview)

Our shopper asks us to develop automation base on app retailer downloaded app or testflight downloaded app.

Is it attainable?
Any supporting doc if can or can’t?

I attempted utilizing appium inspector to detect the weather, appium can examine among the components however not all.

Simply wish to verify if any strategy to do the automation, thanks!