Add a custom STAC extension for the `hls:product` extra field? See https://github.com/stactools-packages/noaa-mrms-qpe/tree/main/extension for an example extension that provides validation for custom fields.
Add a custom STAC extension for the
hls:productextra field? See https://github.com/stactools-packages/noaa-mrms-qpe/tree/main/extension for an example extension that provides validation for custom fields.