Adding smbios sysinfo information to a template

I’m trying to figure out how to add the smbios/sysinfo stuff in libvirt to my template config. It looks like the KVM Raw part will work fine for adding the <sysinfo> stanza. but it won’t work unless I can also get that <smbios> tag inside of the <os> stanza.

An alternative route would be to inject a -smbios attribute into the qemu-kvm command if that is easier than getting the <os> stanza modified.

Does anyone have thoughts on what my options are?