Cemu is a highly popular Wii U emulator primarily designed for Windows, though it recently expanded to include native support for macOS and Linux.
The "Cemu IPA" that users are searching for does exist, but it is not a simple app installation. It is the result of a developer porting the Cemu source code to Apple Silicon. While it proves that the iPhone and iPad are powerful enough to run Wii U games, Apple's strict policies and the developer's distribution choices make this a novelty rather than a viable emulator for the general public right now.
Early Milestones: Some Wii U titles have been observed booting to title screens on high-end iPad hardware.
Benefits of Using CEMU IPA