Select data points for a specific trace from a multi trace plot using plotly

I have a multitrace plot. I want to select data points for a region only for 1st trace. Now the problem is when I select the region it also select datapoints from 2nd and 3rd trace, if there are data points for those traces in the selected region. But I want to select points only for 1st trace.

This is an example for my problem. When I select one trace I also want to show data points only belongs to that trace area. how do I do that?