I can export metadata to JSON format, which is nice as this can now be read into any other tool and manipulated. But I cannot find a way to set the metadata from JSON and so I am left to figure out what changes need to be made via the g-a interface to get to the desired state, and that is hard to get right.

Maybe g-a metadata could grow an import-json function which would set (overwrite) the metadata for the given file(s) from JSON input.

Thanks,
-m