bpmn如何自定义一个类似于UserTask的节点

Question

问题：在contextPad弹框里面点击修改类型 ，希望能添加一个自定义的类型节点，虽然看上去类型修改成功了，但是节点却没有添加到xml中，而且xml中删除掉了之前的节点

目前处理方法：
1.自定义了一个replaceMenuProvider重载node_module里面的方法
import ReplaceMenuProvider from 'bpmn-js/lib/features/popup-menu/ReplaceMenuProvider';
import { forEach } from 'min-dash';
export default function replaceMenuProvider() {
  const customObj = {
    label: 'User report task',
    actionName: 'replace-with-user-report-task',
    className: 'bpmn-icon-user-report-task',
    target: { type: 'custom:UserReportTask' },
  };
  ReplaceMenuProvider.prototype._createEntries = function (
    element,
    replaceOptions
  ) {
    replaceOptions.push(customObj);

    var menuEntries = [];
    var self = this;
    forEach(replaceOptions, function (definition) {
      var entry = self._createMenuEntry(definition, element);
      menuEntries.push(entry);
    });
    return menuEntries;
    // var menuEntries = _createReplaceEntries.apply(this, [
    //   element,
    //   replaceOptions,
    // ]);
    // menuEntries = menuEntries.concat(userReportTask);
    // return menuEntries;
  };
2.在customDescriptor.json中添加了类型描述
{
      "name": "UserReportTask",
      "superClass": ["Element"],
      "meta": {
        "allowedIn": ["custom:UserReportTask"]
      },
      "properties": [
        {
          "name": "body",
          "isBody": true,
          "type": "String"
        }
      ]
    },