Subitem column on Parent

I have searched and if I’ve missed it that is my mistake, but I’m trying to figure out how to add the subitem column as indicated by the purple arrows.

Check out this article in the monday.com support site:

The “Get a visual overview of subitem data” section (which should be linked) is the one you need.

Thank you. Yes, I’ve read that, but it does not cover how to produce the column on the parent row pictured above and here is another example: