如何在不订阅angular中的每个输入/组件更改的情况下更新数据更改的汇总状态？

// 子组件
import { Component, EventEmitter, Output } from '@angular/core';

@Component({
  selector: 'child-component',
  template: '<button (click)="updateData()">更新数据</button>'
})
export class ChildComponent {
  @Output() dataChange = new EventEmitter<number>();
  private data = 0;

  updateData() {
    this.data++;
    this.dataChange.emit(this.data);
  }
}

// 父组件
import { Component, ViewChild } from '@angular/core';
import { ChildComponent } from './child.component';

@Component({
  selector: 'parent-component',
  template: '<child-component (dataChange)="handleDataChange($event)"></child-component>'
})
export class ParentComponent {
  @ViewChild(ChildComponent) childComponent: ChildComponent;
  private summaryData = 0;

  handleDataChange(data: number) {
    this.summaryData += data;
    console.log('汇总状态：', this.summaryData);
  }
}