Hello.
Unfortunately, I am not able to read Japanese, so I cannot read the provided links by you.
The same statement as in my first post is still true. You might want to have a look at the health app. There are potential plans that sound reasonably like your use-case.
If you are looking instead for a fully customized solution, you can create an app on yourself. There are various sources on how to get that going (from the technical perspective at least) here:
- Nextcloud developer documentation — Nextcloud latest Developer Manual latest documentation
- Nextcloud
- Nextcloud App Development Tutorials: 1 step closer to creating an app!
- Develop for Nextcloud
I hope that helps you at least to get a first step. If you have more concrete questions or issues feel free to come back!