color links with gradients in Sankey plots

Hi,
I was looking for adding gradient to sankey links. I would like to reproduce a diagram like this:

I'm highly interested in such an option for R, because I'm a developer of Shiny apps. At the moment, it would be sufficient for me to know a workaround solution, for example custom JS code I could use to add gradients after a sankey diagram is already rendered.

首先定位 Sankey 图的实现以及其链接的渲染路径。将请求的参考图像与当前渲染的图表进行比较，然后确定是否可以直接支持渐变，还是只能在渲染后通过自定义 JavaScript 实现。完成的标准是 Sankey 链接能够直观地支持所请求的渐变行为，或者 issue 中记录了可用的变通方案。