Chart by Gallery Parent

Hi everyone

I am trying to add a chart to each of my gallery items. The idea is that the chart should be displaying only the values of which gallery item is chosen.
However, my chart is currently displaying all the gallery items at one go.
I'm thinking a filter equation might do the trick, but I can't figure out how to write the formula.

Please can someone help?

Thanks so much.

My gallery:

gallery list.PNG

My chart: