On the Assembly Configurations properties page, under Bill of Materials options window, SolidWorks provides three ways to define how a child component is displayed in the BOM.

I am able to read those settings off an Assembly configuration using API

                IConfiguration.ChildComponentDisplayInBOM

But, I am looking for an equivalent API that works on offline files. Is this accessible through Document Manager API? I am open to work around. Any suggestion is much appreciated.