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Is HDF5 available as an input source?

I was reviewing an MSC presentation on the value of output files. Within that presentation was a listing of the f04 file with an h5 called out as LOGICAL HDF5IN and with FLAGS RA.  According to my understanding this means the H5 file is acting as an input to the Nastran model.  I'd like to convert my existing K2GG matrices and other things like that to H5 if possible.  I looked through the 2018 QRF and Reference Manual under the ASSIGN and DATABASE CONCEPTS entries.  I didn't see a mention for how to do it.  I also looked at the INPUTT2 section in the DMAP guide.