Likewise with wkwebview based app i.e. Ionic Appflow.
To comeback to OP’s question:
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Backend queries should be generally speaking no problem
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Fetching part or all the frontend code from the IC (“asset” canister) from an app might be accepted but it has to complies with the guidelines notably and it’s to Apple to accept or not:
4.7 HTML5 Games, Bots, etc.
Apps may contain or run code that is not embedded in the binary (e.g. HTML5-based games, bots, > etc.), as long as code distribution isn’t the main purpose of the app, the code is not offered in a store or store-like interface, and provided that the software adheres to the additional rules that follow > in 4.7.1 and 4.7.2.
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In addition, your app should do more that your website:
4.2 Minimum Functionality
Your app should include features, content, and UI that elevate it beyond a repackaged website.