如何在plotly中从树映射的最外层块中删除悬停文本

import plotly.graph_objects as go

import plotly.graph_objects as go

# 创建树映射图的数据结构
data = {
    'label': 'Root',
    'value': 100,
    'children': [
        {
            'label': 'Child 1',
            'value': 50,
            'children': [
                {'label': 'Grandchild 1', 'value': 25},
                {'label': 'Grandchild 2', 'value': 25}
            ]
        },
        {
            'label': 'Child 2',
            'value': 50,
            'children': [
                {'label': 'Grandchild 3', 'value': 25},
                {'label': 'Grandchild 4', 'value': 25}
            ]
        }
    ]
}

# 创建树映射图的布局
layout = go.Layout(
    title='Tree Map Example'
)

# 创建树映射图的图形对象
fig = go.Treemap(
    labels=[node['label'] for node in data['children']],
    parents=['Root'] * len(data['children']),
    values=[node['value'] for node in data['children']],
    hovertext=[''] * len(data['children']),  # 设置悬停文本为空字符串
    textinfo='label+value',
    textfont=dict(size=16),
    marker=dict(
        colors=['#ff7f0e', '#1f77b4', '#2ca02c', '#d62728'],
        line=dict(width=2)
    )
)

# 绘制树映射图
fig.update_layout(layout)
fig.show()