Add an option to set the opacity of markers in the legend

Can you kindly consider adding an option to set the opacity of legend markers? Currently, the opacities of the legend's markers are tied to the opacity values of the traces.

Plotly Version
plotly.js v2.35.2

Some scatter plots use a very low opacity (<0.10) to display the concentration of overlapping data points.

👇 This can result in imperceptible marker colors in the legend, as shown below:

👇 Feature request: add an option to set the legend marker opacity

I used a workaround to manually set the opacity of the scatterpts class using CSS.

/* current workaround */
.legendpoints .scatterpts {
  opacity: 1 !important;
}

👇 CodePen for Testing

Related posts:

• Issue: px.scatter_geo opacity changes markers opacity and legend items opacity. Is there a way to change one but not the other?
• Legend marker opacity and spacing
• Configuring the alpha (opacity, transparency) for the items in legend of scatter plot of plotly

Thank you for maintaining one of the best DataViz libraries! 👍

使用链接的 CodePen 在 plotly.js 中复现低不透明度的散点图图例标记，并检查 .legendpoints .scatterpts workaround 背后的图例标记行为。定义一个选项，使其值能够独立于 trace 不透明度控制图例标记的不透明度，然后验证图例外观和 trace 渲染都仍然正确。