I have looked up the view component for OrderSummary and apparently, it lacks a lot of customizations. There are only widget locations before and after the summary as well as the cart footer, but none inside the order summary table. Also, if the product has some specification attributes, those attributes will not be displayed in the summary but only for the product attributes.
My suggestion is that either adding some widget zones to the order summary table, where developers can add additional information from the plugins to the product within the summary table or providing options for custom attributes to be displayed within the order summary.