attach method
Implementation
@override
Widget? attach(BuildContext context, ContentViewController controller) {
  return Column(
    crossAxisAlignment: CrossAxisAlignment.start,
    children: [
      if ((controller.description ?? "").isNotEmpty)
        _ParagraphText(
          content: ContentViewItem(
            title: controller.header,
            body: controller.description,
          ),
          controller: controller,
          showDot: false,
        ),
      if (controller.paragraphs.isNotEmpty)
        _DottedTexts(controller: controller),
    ],
  );
}