Assemblies need underlying blocks layout in information tab

In the information tab, for Exodus datasets that include assemblies and are read in the IOSS reader, please add the underlying blocks for each assembly. As an example, I have the following Information tab layout presently. Note, example is from file Cylinders_NS.e (given to Utkarsh).

I want optionally, default on, the assemblies to have blocks shown, looking like this (note, I don't know what blocks go into each assembly, so am making this up). Alternatively, allow each assembly to be expanded by ... clicking on it?

assemblies
    Inner_136
        cylinder_1_12
        cylinder_2_22
        nodelist_21
    TopMiddle_138
        nodelist_31
        nodelist_32
    Base_122
        cylinder_1_12
        cylinder_2_22
        nodelist_32
    Outer_134
        4_cheese_pizza
        anchovies_1
        sausage_4

@utkarsh.ayachit