Adding Selector for UOM on Location for Inventory Transactions

Hi All,

I am trying to add a Selector column onto the Location Selector that will show the Base UOM of the Item:

For the Inventory ID itself it is pretty straight forward:

Yet, when I follow the same logic for the Location, it reduces the Selector to Location ID and Description rather than adding the Base UOM. 
I tried it with InventoryItem and INTran UOM.

Any guidance on how I can accomplish this?
I am just not sure what the steps would be to add the UOM onto a Selector field where the Primary DAC is not really related to the Inventory ID. 
Yet, QTY on Hand shows up, so there has be some relation to the Inventory ID we could utilize?

Any help or ideas are appreciated!