Show child tags under parent tags (Nested Tags)

In the import/export data format there is a concept of parent/child tags. Is there a way to list all child tagged posts under a parent tag Ghost? The Casper Theme doesn’t do this…

Can I list all Child tags with featured posts under a parent tag?

I’d like to play around with this a bit. But I can’t really see where I should start…

@Jesse_Houwing the data model has a field but the feature is not implemented. You can vote on it here: Nested/hierarchical tags, subtags

(archiving as duplicate)