Currently we only seem to be able to import/export one Sandbox setting:

"sandboxEnabled":true

We'd like to be able to import/export all details of the sandboxes (sandbox paths and associated settings: tags, functions, data sources, accessible file paths, etc) we create. We end up needing to create a few of them to prevent certain access between apps, and right now we have to keep recreating the sandboxes when wanting to spin up local versions.