Is it possible to create an app featuring theme extension as an extension-only app?

I want to build an app that provides theme wrapped app blocks and section blocks. Is it possible to build an app like that without using remix as an external only app and publish it to the app store?

you could refer to it

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Not really what I was searching for since I apparently cannot publish an extension-only app the the app store. What I want is to create an app that don’t build with Javascript published to the store. Is that possible?

you mean you want use another tech language (such as php or c# rather than js) to create an app for one only store?