Since the MemoryPack serialized format is not self-describing and has no schema of its own, I decided to co-opt the FlatBuffers schema format to describe the data. The FlatBuffers schema file (.fbs) needs to be first compiled into its binary format (.bfbs) to be used by this tool.
MemoryPack2Json.exe <path to bfbs file> <path to data file>
flatc -b --schema <path to fbs file>