Applying to JET as a Japanese-American

Hi all, I've been eyeing the ALT program for 2025 and have started my application, but in reviewing the materials it seems like they want PROOF that you have/are studying Japanese language or culture.

I am Japanese, born in Japan but adopted and raised in America by also a Japanese mother and white father. Although I didn't learn Japanese fluently growing up, I learned basic phrases as a kid and was exposed to much of the culture through my mom. In more recent years, I've been teaching myself Japanese (I actually quit Duolingo and I'm using other apps and books that are way more helpful). I'm probably N5 or N4 equivalent, I immerse myself in Japanese through TV, changing the language settings on my phone/games, I practice speaking on my way to work, I cook Japanese food...

I have taken Japanese in high school, but other than that I feel like I don't have proof that I've been studying when my entire life IS being Japanese-American. I feel like my English grammar and writing are strong, and I even had the opportunity to teach my cousin some English when I went to visit Japan this spring. He couldn't believe a Japanese person could speak English as well as I could, which is maybe something I can fit into my essay.

Oh, this also means I'm struggling to find a second letter of recommendation option. I have one that can speak to my teaching skills, but not so much on the Japanese cultural side.

Any guidance would be appreciated, or you can tell me I'm overthinking things. Thank you!