通用属性width是否支持设置变量

@Entry
@Component
struct Page1 {
  @State message: string = 'Hello';
  @State widthNum: number = 300;

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .width(this.widthNum)
          .backgroundColor(Color.Blue)
      }
      .width('100%')
    }
    .height('100%')
  }
}