Hey there jonxilinx,
You most certainly could use a field alias to map ChassisType to an appropriate field in the Inventory data model. Maybe the vendor_product field? Totally depends on how robust your environment is, how this new addition could affect any other searches using the Inventory DM (your aforementioned inventory type report), and personal preference on labeling.
In case you have not seen these, here is a link to the CIM reference table documentation - https://docs.splunk.com/Documentation/CIM/4.12.0/User/ComputeInventory
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