Build schematics container for schematics

[jasonxue2]

I have schematic templates, which built from query from a few non-spatial table and create a nice diagram. Now I would like to add container box to each of diagrams. I checked esri video, which are mostly about building container from feature class. however, all of my data are non-spatial data, I build a link table to contain the connection information of all elements. How can I add a box container (blue polygon as below) into this schematics templates? Any Suggestions? Thank you very much.