Support for Japanese imperial year parsing

[wallslide]

Is there any support for this in date-fns?

Currently 2021 is year 3 of reiwa in the Japanese calendar. Would be nice to be able to parse these dates somehow using date-fns.

Explanation
https://en.wikipedia.org/wiki/Japanese_imperial_year

Another library which does these conversions
https://github.com/hangilc/kanjidate

A guide to year/month mappings between gregorian and japanese calendar years
https://www.seattle.us.emb-japan.go.jp/files/100049285.pdf