uni-app qiun-data-charts无法显示tooltip

如下代码无法使得图表展示tooltip

<template>
	<view style="overflow: hidden; background-color: #fff;box-sizing: border-box; border-radius: 5px; box-shadow: 4px 2px 6px #ccc;padding: 10px; position:relative;">
		<view style="font-weight: bold; font-size: 40rpx; color: #4c4c4c;">能耗信息</view>
		<view class="charts-box">
			<bn-title-bar height="15px" font-size="30rpx">
				近30天设备用电趋势
			</bn-title-bar>
			<qiun-data-charts type="column" :opts="opts" :chartData="chartData" :canvas2d='true' tooltipFormat="tooltipForUnit"/>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				chartData: {},
				//您可以通过修改 config-ucharts.js 文件中下标为 ['column'] 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: {
					update: true,
					color: ["#52c88d", "#52c88d"],
					padding: [15, 5, 12, 5],
					enableScroll: false,
					dataLabel: false,
					canvas2d: true,
					legend: {},
					xAxis: {
						disableGrid: true,
						fontSize: 10,
						labelCount: 10,
						rotateLabel: false,
					},
					yAxis: {
						gridType: "dash",
						dashLength: 2,
						disabled: false,
						showTitle: true,
						data: [{
							title: "kWh",
						}]
					},
					extra: {
						column: {
							type: "group",
							width: 15,
							activeBgColor: "#000000",
							activeBgOpacity: 0.08,
							linearType: "custom",
							seriesGap: 5,
							linearOpacity: 0.5,
							barBorderCircle: true,
							customColor: [
								"#39fae4",
								"#52c88d"
							]
						}
					}
				}
			};
		},
		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 = {
						categories: ["2018", "2019", "2020", "2021", "2022", "2023"],
						series: [{
								name: "目标值",
								data: [35, 36, 31, 33, 13, 34]
							},
							{
								name: "完成量",
								data: [18, 27, 21, 24, 6, 28]
							}
						]
					};
					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>

解决方式

去除父级的position: relative