is there any SEO challenges if we inject our own detailed blog schema in header when ghost has already created a basic one. Does any one know if duplication of this nature impact how google reads the site or blog?
Google can process multiple JSON-LD blocks on a page, but they should either
Describe different entities (e.g., Organization, WebSite, BreadcrumbList, FAQPage),
If you inject a second BlogPosting schema with different values (headline, author, dates, image, URL, etc.), Google may ignore one of them or report structured data inconsistencies. It usually won’t cause a ranking penalty