HarmonyOS List组件能实现ListItem的局部刷新吗？

@Component 
struct Child { 
 @Link items: TestList[]; 
 
 build() { 
  Column() { 
   ForEach(this.items, (item: TestList) => { 
    ChildChild({ item: item }); 
   }) 
   Button(`Button: push`).onClick(() => { 
    this.items[0].index1 = 3; 
    this.items[0].str = 'Third'; 
   }) 
  } 
 } 
} 
 
@Component 
struct ChildChild { 
 @State item: TestList = new TestList(); 
 
 build() { 
  Column() { 
   Text(`${this.item.index1}+'-----'${this.item.str}`) 
  } 
 } 
} 
 
@Entry 
@Component 
struct Parent { 
 @State arr: TestList[] = []; 
 aboutToAppear() { 
  let test1: TestList = new TestList(); 
  test1.index1 = 1; 
  test1.str = 'First'; 
  this.arr.push(test1) 
  let test2: TestList = new TestList(); 
  test2.index1 = 2; 
  test2.str = 'Second'; 
  this.arr.push(test2) 
 } 
 
 build() { 
  Column() { 
   Child({ items: this.arr }) 
   Button(`Button: push`).onClick(() => { 
    this.arr[1].index1 = 4; 
    this.arr[1].str = 'Fourth'; 
   }) 
  } 
 } 
} 
 
@Observed 
class TestList { 
 index1: number = 0; 
 str: string = ''; 
}