I have developed an Emacs/Org Mode package that can export subtrees or whole files to Markdown files. The front-matter stuff like title, author, tags, categories, dates gets auto-derived. These Markdown files are Hugo compatible.

See https://ox-hugo.scripter.co.

Dozens of ox-hugo + Hugo users have shared their sites and site source in Org mode here: https://ox-hugo.scripter.co/doc/examples/