If any games have been saved while playing them with yuzu, there should be a folder inside sysdata named 00040000 . This folder contains all of the save data for Switch titles.
Where does yuzu dump?
The dump location for ACNH is in C:\\Users\\[username]\\AppData\\Roaming\\yuzu\\dump\\01006F8002326000\\romfs .
Where do you put yuzu games?
9b. in yuzu, click on + Add New Game Directory in the browser, and navigate to the folder where you placed your XCI or NSP files.