Steps to reproduce:

1. Create an item value widget.
2. As Item, select an item with Type of information: Text.
3. In Description, use {ITEM.VALUE} macro with a macro function. For example: {{ITEM.VALUE}.iregsub("^([a-z])", \1)}
4. Save the widget.

Result:
Item value is displayed in the description.
Expected:
The results of macro function should be displayed.