Using New Outlook on Windows for personal email, calendar, and contact management
I switched to new Outlook today after one of my issues was fixed (ie. sorting folders), only to discover another showstopper issue. It's back to classic Outlook for me.
I wouldn't hold your breath for Field Chooser to be included in new Outlook. According to the below link for classic vs new feature comparison, Field Chooser isn't even a feature of classic Outlook!
Feature comparison between new Outlook and classic Outlook - Microsoft Support