是否可以在Plotly中更改图例框的大小？

import plotly.graph_objects as go

fig = go.Figure()

fig.add_trace(go.Scatter(
    x=[0, 1, 2],
    y=[0, 1, 2],
    name="Trace 1",
    legendgroup="group1"
))

fig.add_trace(go.Scatter(
    x=[0, 1, 2],
    y=[2, 1, 0],
    name="Trace 2",
    legendgroup="group2"
))

fig.update_layout(
    legend=dict(
        bgcolor="lightgrey",
        bordercolor="black",
        borderwidth=2,
        x=0.5,
        y=0.5,
        xanchor="center",
        yanchor="middle"
    )
)

fig.show()