'hovertemplate' not passable as an attribute into a dataframe in a sankey diagram's nodes/links

The 'hovertemplate' attribute is not working when passed into the 'nodes' or 'links' dataframes in a sankey diagram. "Node" and "link" are arguments for the sankey's links and nodes and are of type dataframe which contain arbitrary data for the links and nodes, as well as attributes of links and nodes (see plotly::schema() for a list of all available attributes for each trace). Reprex here is unnecessary since my question is why 'hovertemplate' cannot be passed into the 'nodes' or 'links' as attributes when other attributes such as 'color' and 'hoverinfo' are passable? Is there any workaround to this?

fig <- plot_ly(
      type = "sankey",
      orientation = "h",
      node = nodes, # dataframe which includes sankey trace data and attributes
      link = links, # dataframe which includes sankey trace data and attributes
      valueformat = ".0f")

fig 

未指定实现文件或测试。首先检查 plotly::schema() 中 Sankey 节点和链接的属性，然后跟踪节点和链接数据框的转换方式；完成的标准是确定 hovertemplate 为何不同于 color 和 hoverinfo，并记录已确认的解决方法或受支持的行为。