Adding a multi-line field as variable in Zoho Flow

Adding a multi-line field as variable in Zoho Flow

I am trying to set up slack notifications for one of our custom modules and want to create it so that it includes 'Notes' [a multi-line field] in the slack notification message. The 'Notes' field isn't showing up as a variable I can include though... Has anyone run into this problem before? Is there a way to override it?