@danpbow create a batch script (with .bat extension) to do exactly as you need.
At the end of the wmic command tack on output redirection like > \\x.x.x.x\my_share$\%computername%.txt
Ending a share name with $ in windows makes it undiscoverable, this is a security thing I recommend you do. The share should allow read/write in the share and security tabs for anonymous logon - this is because the fog client runs as system on the local machine.
Once the script is working manually, you would create a new snapin and use the batch template and upload the script. Then just try it out on a few hosts in fog web interface.