Kudos to the creators for getting the CMS field definitions right by allowing arbitrary amounts and types of fields! It's so annoying to me that so many CMS's and static site generators start out with the assumption of 1 big rich text / markdown "body" for content and treat everything else on the page as miscellaneous stuff (meta-fields, yaml front-matter, etc).
Is it for meta information about a post? Are those fields injected into a post somehow? How are those fields used? (I'm ignorant of CMSs)