toJsonLd method
Convert to a complete JSON-LD string with @context.
This is what gets injected into the document head as a
<script type="application/ld+json"> tag.
Implementation
String toJsonLd() {
final map = <String, dynamic>{'@context': 'https://schema.org', ...toMap()};
return const JsonEncoder.withIndent(' ').convert(map);
}