vue3+wangEditor 5 如何设置默认字体大小

已尝试使用defaultContent无效：

<template>
    <div style="border: 1px solid #ccc">
      <Toolbar
       style="border-bottom: 1px solid #ccc"    
       :editor="editorRef" 
       :defaultConfig="toolbarConfig"
       :mode="mode" />
      <Editor 
      style="height: 500px; overflow-y: hidden;" 
      v-model="valueHtml" 
      :defaultConfig="editorConfig" 
      :defaultContent="jsonContent" 
      :mode="mode"
       @onCreated="handleCreated" />
    </div>
</template>

const jsonContent =ref([
        {
          type: "paragraph",
          children: [{ text: "黑体" }],
          fontSize: "38px",
          fontFamily: "黑体",
          lineHeight: 1.5,
        },
      ],)
//https://blog.csdn.net/weixin_55896343/article/details/138808762

github上的issue  https://github.com/wangeditor-team/wangEditor/issues/4042 然并卵