[Feature request] I think there should be an easy and straightforward way to change opacity in plotly express cloropleth maps

Many times in GIS and map visualization, it is useful to add a certain degree a transparency to a vector layer to see which features of the baseline map are covered by the tiles.
To my knowledge, there are options for selecting continuous and discrete color scales.
However, there isn't an option for removing the color altogether (visualizing only the vector borders) or changing the opacity of the color

从 Plotly Express 的 choropleth 实现及其现有的连续和离散颜色刻度选项开始。检查矢量边界和地图图层的表示方式，然后定义在保留边界的同时移除填充颜色或应用透明度时的预期行为。当所请求的不透明度和仅保留边界的行为得到支持，并由相关测试覆盖时，即视为完成。