如何在分配给formControlName的对象中添加附加属性

import { Component } from '@angular/core';
import { FormControl } from '@angular/forms';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponent {
  myFormControl: FormControl = new FormControl();
}

this.myFormControl.setValue({ value: 'example', additionalProperty: 'additional value' });

this.myFormControl.patchValue({ additionalProperty: 'additional value' });

<input type="text" [formControl]="myFormControl" formControlName="myFormControl">

console.log(this.myFormControl.value); // 输出表单控件的值
console.log(this.myFormControl.value.additionalProperty); // 输出附加属性的值