https://docs.magnolia-cms.com/product-docs/6.2/Templating/Site-definition/How-to-use-Multisite.html#_mappings_and_domains

The example image shows a name property underneath the "domains" node. This is not mapped by the Node2BeanTransformer and is missing in the setSites method of the MultiSiteModule.

Another example would be to use a content node, named "www.best-comics.net", or a single domain node with the name property -> /domains/bestcomics@name=www.best-comics.net

If there is a hidden mapping somewhere in the code, I would love to know how it works.