I'd like to have a custom column in Wireshark that shows whether the traffic is incoming or outgoing.

I was hoping I could enter a boolean in the fields column like this:

[![Column Preferences](https://i.stack.imgur.com/cZ0Fw.png)](https://i.stack.imgur.com/cZ0Fw.png) 

This gives an error though. Is what I'm trying to do possible?

I know I can use colorization to indicate incoming and outgoing but it's more hassle.