YTD column in column chart

Hi,

I have a line and stacked column chart.
On the y-achis EURO und on the x-achis Month.
The column shows Euro per pieces.

I need a column or a line which shows a YTD Value. Like shown in the picture.
The problem is, that any value which I insert is bound on each month and like that I wont get an YTD Value for 2020.

I hope you understand my problem and have a solution for me.

Thanks in advance.

Lennart