It turns out that the Nintendo Switch OLED Model comes with a 4K and 60 Hz-capable dock. Available to purchase separately, the new Switch Dock also has an integrated LAN port.
https://www.notebookcheck.net/Nintendo-Switch-4K-and-60-Hz-support-may-come-to-the-OLED-Model-via-a-dock-firmware-update.571763.0.html