Backup/Archive a particular version of an app How can I archive a my currently installed app version (particular version) of an iOS app (=export IPA file?)

I am aware that apple removed the App Store from iTunes and that apps are not part of the backups any more.

However I am looking for a solution with which I can draw my currently installed app version as IPA file before I upgrade.

Since app authors can modify and remove functionality at will and Apple prevents people from going back to a previous version I would like to be safe, particularly when large changes happen.

I have looked into iMazing but it only seems to be able to export the latest version from the AppStore to IPA (neither the currently installed version nor different version)
This isn’t feasible since you can’t really restore or install the IPA even should you manage to back them up. We engage with app developers as a business so they can sell to us direct when we need to manage upgrade cadence or pin an app, but ever forward is the model for consumers now.