Portable Text Conversion Convert external content (HTML, Markdown) into Portable Text for Sanity. Three main approaches: 1. — Convert Markdown directly using (recommended for Markdown) 2. — Parse HTML into PT blocks using (for HTML migration) 3. Manual construction — Build PT blocks directly from any source (APIs, databases, etc.) Portable Text Specification Understand the target format before converting. PT is an array of blocks: Key rules: - Every block and span needs (unique within the array) - is for text blocks; custom types use their own - holds annotation data; on spans reference or ar…