Frontmatter: binder vs jupyter

[pancakereport]

I'm wondering about the difference in frontmatter between binder and jupyter: binder. There isn't a ton of explanation for binder in the frontmatter available fields documentation. I see a lot for in-page execution with the jupyter: binder option here. What is the binder option for? Are there subfields available for binder? I also see that the page can override project for binder but not jupyter. What's up with this?

Separately, but related, I'm interested in why jupyter can only be set at the project level. At Berkeley we have some documentation made with myst that is primarily static markdown. There's only really one page that involves executable code. We have this documentation configured with jupyterlite, which has to be set at the project level for all pages. I wish I could turn on in-page execution just where it's needed (one page) and not for the whole project.