r/Cemu and the Cemu wiki have guides on how to dump your own games from a Wii U console. That's the only fully legal route.
It sounds like you're looking for hosted on Archive.org . wii u roms archive.org
Yes, the files exist on Archive.org, but they are piracy, frequently removed by Nintendo, and not officially endorsed by Archive.org. Use at your own legal risk. r/Cemu and the Cemu wiki have guides on
Here’s the direct and practical answer: the files exist on Archive.org