Is it possible to search for additional fields besides Name in ComboBox dropdowns?

Is it possible to specify an extra column or 2 to be used for searching against when typing text into a combobox in Freedom UI? The use case is that users can select an Account in the ComboBox lookup, but should be able to search in that dropdown combobox using either the account's Name, or its Account Number.

I know it's possible to do this by opening up the modal lookup window when that's configured, but to save some clicks ideally it would be possible to just type/paste into the combobox to achieve this behaviour.