<cover-view slot="callout">
    <cover-view wx:for="{{markers}}" wx:key="mid" class="customCallout" marker-id="{{ item.id }}">{{ item.name }}</cover-view>
</cover-view>

CSS：
.customCallout {
    margin: 35rpx 0 5rpx;
    width: fit-content;
   box-sizing: border-box;
  padding: 2rpx 8rpx 5rpx;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 6rpx;
  font-family: YouSheShaYuFeiTeJianKangTi;
  font-size: 12rpx;
  color: #434343;
  line-height: 18rpx;
  text-align: center;
  font-style: normal;
}