An editable list of flat key/value pairs — drag or Alt+Arrow to reorder, switch a row off instead of deleting it, paste a block of Key: value lines, and see both halves of every duplicate key.
npx shadcn@latest add @zyeon/key-value-editorZyeon UI limits how often it can be asked, and Key Value Editor hasn't had its turn. Its source will show here once it has.