There is not any way to do this. The Inno uninstall engine cannot contain embedded files.
But on the other hand there's no particular need for it to do so either -- you can just install any files that it requires (into a subfolder of the app folder, if you want to keep things tidy).
The only real reason that the setup files are embedded into the installer is that it makes downloads easier. The uninstaller doesn't have that excuse.
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