You can achieve that using Promotional Offers starting with iOS 12.2.
Read more about it here on my StackOverflow answer: https://stackoverflow.com/a/71115183/611879
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I had the same issue and after a few hours of trying to figure it out, I switched to Swift Package Manager instead and completely removed Cocoapods from the project. Now it works, and honestly, the whole project is a lot cleaner without Cocoapods.
I couldn't find any info about it either. I assume they will release new App Store Connect APIs - https://developer.apple.com/documentation/appstoreconnectapi/app_metadata to automate the process.