Javascript 如何将对象的嵌套对象转换为对象数组

大家好，我有以下code张照片

我想要转换的数据.

    const obj = {

     numbers: {
      label: "main numbers",
      pageTitle: "Numbers",
      key: "1",
        items: {
          firstNumber: {
            label: "first number",
            pageTitle: "first",
            key: "first"
           },
         secondNumber: {
            label: "second number",
            pageTitle: "second",
            key: "second"
           }  
        }
     },

    letters: {
      label: "main Letters",
      pageTitle: "Letters",
      key: "2",
         items: {
           firstLetter: {
            label: "first Letter",
            pageTitle: "first",
            key: "first"
         }
       }
     },

    signs: {
       label: "main sign",
       pageTitle: "Sign",
       key: "3"
    }
 };

在我的obj变量中，我还有另外3个对象

numbers个对象，具有items个属性，其中包括2个其他对象.

letters个具有items个属性的对象，其中只包括一个对象.

signs个对象.

我需要将我的obj转换为以下方式.

    [
      {
        label:"main numbers", 
        pageTitle:"Numbers", 
        key:1, 
        children: [{label,pageTitle,key},{label,pageTitle,key}] 
      },
      {
        label:"main Letters", 
        pageTitle:"Letters", 
        key:1, 
        children: [{label,pageTitle,key}] 
      },
     {
        label:"main sign", 
        pageTitle:"Sign", 
        key:1, 
        children: [] 
      },


    ]

对于该转换，我编写了以下代码.

    const transformedData = Object.values(obj).map((menuitem) => menuitem);

    const data = [];

    transformedData?.map((x) => {
      const newData = {};
      newData.label = x.label;
      newData.pageTitle = x.pageTitle;
      newData.key = x.key;
      newData.children = x?.Object?.values(items)?.map((el) => {
        newData.children.label = el.label;
        newData.children.pageTitle = el.pageTitle;
        newData.children.key = el.key;
      });
      data.push(newData);
    });

一切正常，但对于children，它打印的不是一个数组，而是undefined.

请帮我解决这个问题.