Postie, Email, and JSON-LD format

We’re pushing posts from google sheets. The post content is fine, as they are wrapped in HTML tags as per our instructions, so that we can post to classic editor plain text. However, although the Schema markup JSON-LD looks right in the sheets cell, by the time it’s in WP classic editor, it’s no longer formatted as JSON-LD should be, it’s wrapped or something. Do you suppose this is happening during it’s short little email trip, or is Posties <div> unravelling the JSON-LD structure? Anyway, if anyone has ideas, or troubleshooting ideas, leave them below. Thanks!