Aggregation callbacks in report builder

In Workplace report builder we had a function column::set_aggregation_callback()

In the LMS report builder it is missing.

I would like to have a possibility to define how the aggregated data is displayed.

This is especially useful for the fields such as

• boolean - when it is single value I want to display Yes/No, when it is "Average" - I want to display "70%" (for example)
• integer - when it is "Average" it becomes float and I want to format it with a necessary number of decimal points
• this is a integer field but we display custom values, for example, 0 - none, 1 - some, 2 - all - I want to be able to display something useful when "Average" is used and not just "1.5"