Dynatable - show delta and delta in %

Currently I can view the data of previous year actual and the current year budget. But I cannot see the difference between those numbers in a dynatable. Are we on track as planned? Are we ahead of last year?
Usually we create in a spreadsheet those delta and delta in %. Comparison helps to understand the numbers.

Please add those columns to the dynatable either by adding buttons to add those or by asking the JedoxAI to add the columns.