The field I am trying to show is a post type. I tested with another field type though and it doesn't work either.
EDIT: Nevermind, figured this out too haha.
The dot notation nor the JSON notation seems to be working properly. It adds the column but it doesn't accept any of the settings I'm inputting. For instance, I put this in.
https://www.awesomescreenshot.com/image/6606376?key=7043812548afc5de5e23ebeecb9ee9ac
It inserts the column but after the date and not after the title.
EDIT: Nevermind, figured it out.