Valve.VR.HmdMatrix34_t to UnityEngine.Transform

Hi,

I am trying to get pass this error cannot convert from 'Valve.VR.HmdMatrix34_t' to 'UnityEngine.Transform' when importing MixCast SDK. Does anyone know how to cast
'Valve.VR.HmdMatrix34_t to'UnityEngine.Transform?
I've looked at https://valvesoftware.github.io/steamvr_unity_plugin/api/Valve.VR.HmdMatrix34_t.html struct and it it does not help me much.