How to add a mesh into a map in UELibraryApp?

In the documentation of “build Unreal Engine as a library”, the sample library App and Project only show how to load in a map. There’s little information about expanding the API, the only extra LAUNCH_API I found after some digging in the code was GuardedMainWrapper, but it needs a command line to communicate with the engine. Do I need to make my own API or is there a command line for GuardedMainWrapper that can do this task?

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