During my PhD studies, we have developed a JSON parser for FPGAs [0] that could in theory be turned into silicon if somebody really wanted to. In our evaluation we showed that it is a magnitude faster than at least the AVX-256 version of simdjson that was available at the time on a single JSON document.
[0] https://dl.acm.org/doi/abs/10.1145/3533737.3535094