Hi,
Problem Statment:
I want to add a company and country column in the staff ticket listing table for all ticket statuses (e.g. Open, CLosed etc.)

I have tried added from here,

By doing this, sometimes columns are added but sometimes not. Anyways, after adding columns, there is no data source in the given list.
How can I add the data source in the dropdown?

(Company and country has separate table and IDs are in tickets table)