I've long used a toylike "Lists and Maps of Strings" format for personal recordkeeping and automation. https://www.npmjs.com/package/lamos https://www.npmjs.com

I've long used a toylike "Lists and Maps of Strings" format for personal recordkeeping and automation. https://www.npmjs.com/package/lamos https://www.npmjs.com/package/lamos I've never gone back to formalize the grammar or otherwise mature it. But it's served me well as-is, and it's been easy to convert "up" to JSON or YAML or XML or what-have-you, once the case for an interface beyond plain text proves worthwhile.