simdjson is listed thought.
It is mentioned here: https://github.com/bytedance/sonic/blob/a577eafc253adb943924..., but it isn't included in the benchmarks graphs. Seems this repo is specifically focused on Golang and isn't necessarily motivated by being the fastest JSON [de]serializer on the planet.
There is this one though: https://github.com/minio/simdjson-go
EDIT: Apologies, simdjson-go is included in the benchmarks and discussed as well.