For example in a matrix or grid say a person hovers over a product ID, the tooltip I want to assign to that is the Product Name, Product Desc, and Product Weight.
I don't want to just add those extra three columns to the visual as they are not needed and would clutter up the page. However, if a person looks at a product ID in this context Name, Desc, and Weight are the three fields they will want to know. Making them flip over to a product ID lookup is not ideal.
Several other BI apps offer these attribute drill through or hover over description options, I didn't know in PBI did and I am just unaware.