add label alignment in nodes in Sankey plot

Dear devs,

Recently, I have been playing around with Sankey plots in plotly. This tool is really great. I have been looking for a specific feature that I couldn't find in the API and in fact I believe it does not exist, yet.
Would it be possible to specifiy the alignment of the labels in the nodes of a sankey plot?
Specifically in vertical orientation, I believe the nodes would look much prettier, if the label may be horizontally aligned with the box.

I would imagine additional keywords for the node-dictionary like "horizontalalignment" and "verticalalignment".
(As it is the case for matplotlib textboxes :
https://matplotlib.org/3.1.1/tutorials/text/text_props.html)

Possibly, this is actually easily implemented, but I could not really figure out, how to do that myself.

Is it possible to add this feature?

该 issue 涉及为 Sankey 节点标签添加水平和垂直对齐功能，但没有指出源文件、测试或入口点。首先定位 Sankey 节点 API，并查看链接的 Matplotlib 文本属性参考；当针对垂直方向的 Sankey 图支持并记录了对齐选项时，即视为完成。