Nintendo gaming consoles are typically pretty well locked down (at least initially), and are a tough nut to crack for enthusiasts. About the closest that homebrew wizards came to prying inside the inner working of the Nintendo Switch was to find a hidden NES Golf game, which was included in honor of late Nintendo president Satoru Iwata.
However,

Source: Hot Hardware – Nintendo Switch Homebrew Launcher Could Allow Custom Software Via NVIDIA Backdoor