Go to the Site Settings,
Galleries,
Site Columns,
Create (button at the top left),
Enter a Column Name,
Check the box - Hyperlink with formatting and constraints for publishing,
Hit OK
Now Go to your List/Library,
Go to Settings,
Do "add from existing site column",
Locate your recently created "site column" from the group you selected
previously,
Select it, Click Add and OK,
Now you have a new URL column that allows you to make the hyperlink
open in a new window.
