These are automatically generated from code using schemars. They're locked behind a feature flag to avoid building unnecessary code for release builds, and you can generate them like so:

cargo run --features="generate_schema" -- --generate_schema > schema/nightly/bottom.json

Alternatively, run the script in scripts/schema/generate.sh, which does this for you.

To publish these schemas, cut a new version by copying nightly to a new folder with a version number matching bottom's (e.g. v0.10 if bottom is on v0.10.x bottom). Then, make a PR to schemastore updating the catalog.

For more info, see the schemastore repo. An example PR can be found here.