Raw file Encoder/decoder 3.x Provider

[Norman Ashley (nashley)]

Hi OpenSSL,
I am working on a provider for XMSS and LMS signatures. The keys are currently dumped in unencoded files (no PEM/DER formats). I have experimented to encoding said files.
But, for now,  is there way to have the provider register and decoder that handles the raw files when using standard openssl commands like sign/verify?
Thanks,
Norman