DataViews in AppStudio/Kinetic are dynamic, they can be created at will (with n number of columns) and columns can be added dynamically.
To add a column, simply set that DataView.Column to a value.
For example, in row-update widget, you can do this, with no prior setup:
and from then on, you can access the value in that dataview.column with {AnyDVName.AnyColumnName}