As far as I know there is no built in option in the Google Chart API to “turn this on”. The only way I can see this happen is that you sum up all previous values for each list item in your list in a new column and then add a second series in your chart that shows the values from this field.
I follow your advices and it’s work fine – Thank you.
On my graph I try to force/select 2 values in filters. So i change “multiselect” in true, but i don’t know how to write correctly the multiple values in “selectedValue”.
For exemple i would like to force “2019” and “2020”. I try several things but nothing works at yet.
Can you help me ?