“准瀑布”图表 - 一种衡量标准与另一项措施的比例

I would like to build a kind of waterfall chart in Tableau and unfortunately I ran out of ideas. The ultimate goal would be to have the same chart as produced by Excel. But for the beginning it would be nice to have at least the column named "weight", which is a result of calculation on 2 measures: I would like to build a kind of waterfall chart