Hello,

This feature is in QuickBooks Online.

1. Make sure you have account numbers turned on in Gear Icon/Account and Settings/Advanced

2. Make sure you have account numbers entered in the account number field for an account

3. From your Chart of Accounts, click "Run Report" in the upper right corner

This should give you a report of your Chart of Accounts with the account number.  You can also add or remove columns by clicking the customize button on the report screen.

(picture attached)