Plotly R图例与组名

Question

我想在图表中创建一个图表，我将图例分组，但不是在图例中显示跟踪名称，而是只显示组名称。

我的代码如下：

p = plot_ly() %>%
  layout(
    font = list(family = "Arial"),
    legend = list(x = 0.07, y = 1))
p = add_trace(p,
              x = x, 
              y = y, 
              line = list(color = "blue", width=4),
              legendgroup = "Average",
              name = "Average",
              type = "scatter",
              mode = "lines+markers"
)
for (i in 1:ncol(df)){
  p = add_trace(p,
              x = x, 
              y = df[,i],
              legendgroup = "Individual",
              line = list(color = "gray"),
              name = P_names[i],
              type = "scatter", 
              mode = "lines+markers"
              )
}

理想情况下，我想要的是一个传奇盒，只有：＆＃34;平均＆＃34;和＆＃34;个人＆＃34;。这可能吗？

谢谢！