How to get app ui-extension and other code from live app.

[VinitGusai]

Hello, I had setup an Checkout UI extension app in one of my store and used to update it from my laptop. But due to miscommunication with my colleague and he deleted all the data of app.

But now I needed to update of app and I have to configured it with git or any thing else. How can I get app build now as Shopify cli doesn't have any command for importing already uploaded code of latest version. I have backup of one of extension which I needed to update but not other extensions so I can't deploy any new version.

If anyone know which step should I take as or is there is way to setup existing app in my new system please let me know.