PageBlockSlideshow.fromJson constructor
Parse from a json
Implementation
factory PageBlockSlideshow.fromJson(Map<String, dynamic> json) =>
    PageBlockSlideshow(
      pageBlocks: List<PageBlock>.from((json['page_blocks'] ?? [])
          .map((item) => PageBlock.fromJson(item))
          .toList()),
      caption: PageBlockCaption.fromJson(json['caption']),
    );