If there is any meta data attached to an item in GatherContent, it can be imported to Sitecore as well.
Add meta data fields
You should add meta data fields to your GatherContent Templates Just like any other fields that you want to be mapped and copied during the import process.
If meta data content is independent of a specific language within a multilingual project, it should be mapped only once in any language specific mapping. Otherwise, meta data fields should be mapped for every language independently as any other content.