您可以使用Stack和dotted_line包组合来创建如下内容：

Stack(children: [
            DottedLine(
              direction: Axis.vertical,
              lineLength: linelength,
              lineThickness: 1.0,
            )
            // You ListTile Code
          ],)

多亏了@pmatatias评论，我想通了，这是我用来获得想要的输出的更新代码。

Widget ruleTile(String title, num index) {
    Widget connector = const DashedLineConnector(
      color: Color(0xFFFACC15),
      gap: 3,
    );

    return TimelineTile(
      node: TimelineNode(
        indicator: Image.asset(
          "assets/images/sun.png",
          width: 40.w,
        ),
        startConnector: index == 0 ? null : connector,
        endConnector: index == rulesList.length - 1 ? null : connector,
      ),
      nodeAlign: TimelineNodeAlign.start,
      contents: ListTile(
        contentPadding: EdgeInsets.zero,
        title: Text(
          title,
          style: MyTextStyle.littlesmaller,
        ),
      ),
    );
  }