最新版本的Ucharts支持，目前还不支持自定义换行

<template>
  <view class="charts-box">
    <qiun-data-charts 
      type="ring"
      :opts="opts"
      :chartData="chartData"
    />
  </view>
</template>

<script>
export default {
  data() {
    return {
      chartData: {},
      //您可以通过修改 config-ucharts.js 文件中下标为 ['ring'] 的节点来配置全局默认参数，如都是默认参数，此处可以不传 opts 。实际应用过程中 opts 只需传入与全局默认参数中不一致的【某一个属性】即可实现同类型的图表显示不同的样式，达到页面简洁的需求。
      opts: {
        rotate: false,
        rotateLock: false,
        color: ["#1890FF","#91CB74","#FAC858","#EE6666","#73C0DE","#3CA272","#FC8452","#9A60B4","#ea7ccc"],
        padding: [5,5,5,5],
        dataLabel: true,
        legend: {
          show: true,
          position: "right",
          lineHeight: 25
        },
        title: {
          name: "收益率",
          fontSize: 15,
          color: "#666666"
        },
        subtitle: {
          name: "70%",
          fontSize: 25,
          color: "#7cb5ec"
        },
        extra: {
          ring: {
            ringWidth: 60,
            activeOpacity: 0.5,
            activeRadius: 10,
            offsetAngle: 0,
            labelWidth: 15,
            border: true,
            borderWidth: 3,
            borderColor: "#FFFFFF"
          }
        }
      }
    };
  },
  onReady() {
    this.getServerData();
  },
  methods: {
    getServerData() {
      //模拟从服务器获取数据时的延时
      setTimeout(() => {
        //模拟服务器返回数据，如果数据格式和标准格式不同，需自行按下面的格式拼接
        let res = {
            series: [
              {
                data: [{"name":"一班","value":50},{"name":"二班","value":30},{"name":"三班","value":20},{"name":"四班","value":18,"labelText":"四班:18人"},{"name":"五班","value":8}]
              }
            ]
          };
        this.chartData = JSON.parse(JSON.stringify(res));
      }, 500);
    },
  }
};
</script>

<style scoped>
  /* 请根据实际需求修改父元素尺寸，组件自动识别宽高 */
  .charts-box {
    width: 100%;
    height: 300px;
  }
</style>

如果需要显示百分比

可以自行对数据进行计算处理。

var list = []
						let total = 0
						var list = []
						res.Data.Details.forEach((type) => {
							total = total + type.Number
						});
						res.Data.Details.forEach((type) => {
							var percentage = Number(Number((type.Number / total) * 100).toFixed(0))
							var data = {
								"name": type.Name,
								"value": type.Number,
								"labelText": type.Number + '辆' + '\n' + percentage + '%'
							}
							list.push(data)
						});