Waterfall Chart - Add an additonal line

Hello,

I am a newbie & hope for your support

I have a waterfall, but to analyze the data correclty I would always need to see the percentages as well (and how they changed vs the previous period). In best case like an additional line.
But I am open for other solutions as well.

Attached you find my data (I added my desired line in red).

Do you have an idea how to solve this?

Thank you