Where to look for volunteering work

Hello
Anyone know is there organization in tokyo that organized volunteering/ teaching for children/teenager (especially who came from low socio economy background) ?

I am a backend and cloud engineer with 7 years of experience, I could allocated few hours per month. I live in tokyo for about a year and speak english quite well

I have looked for such group in both meetup and my local ward website but can’t find any.

The closest one is youcode jp but they are a paid classes unfortunately

Thank you