ShopTo in the UK got a mic/earphone set on sale so it must have voice chat :) - http://www.shopto.net/video-games/switch/SWAC01-switch-in-ear-stereo-gaming-headset, Not an official product but states as universal across platforms.
Key features:
-13mm Speaker drivers - superior sound clarity to enhance your gaming experience
-Inline volume control unit - ergonomically designed control for in-game volume
-Soft ear-hook and 3 sets of ear grommets(small, medium and large) - for maximum comfort during gameplay
-Adjustable flexible microphone - fully adjustable microphone for live in-game chat
-1.2 metre flat cable - with 3.5mm jack (2.5mm adaptor cable provided for Xbox 360)
-UNIVERSAL - compatible with PS4, PSP, Xbox One (requires adaptor), Xbox 360, Nintendo Switch & PC and Mac
