Modify subplot of scatterplot matrix(plotly.graph_objects.Splom) from Dash app

Hello,

I am new to Dash and I am trying to modify with a callback a subplot of a scatterplot matrix (plotly.graph_objects.Splom).
I did not figure out how I could achieve that as there is no id associated to this subplot.

Is there a way to do that ?

Thank you for your help

Tom