Adoption in Japan

Hi there. I was wondering if anyone in the sub has knowledge about the adoption process in Japan, specifically for foreign residents. My wife (Japanese) and I have one daughter but have struggled conceiving another. I have looked into adoption and it’s hard to find anything in English regarding the process. I speak Japanese well enough but do not read so well, so it’s hard to read the information there is about it in Japanese. Anyone been through this process or know of any informative links I could research or places I might call would be appreciated. Thanks and happy weekend all!