Please make it possible to show tooltips in field labels, quick filters, and parameters.
The tooltip format could be HTML. One important benefit would be the possibility to link to more information.
The tooltip should support multiple languages, see also Multiple column aliases at data source level
The tooltip could be typed in columns' default properties and thus stored in workbook twb, twbx or data source tds, tdsx, but could also be stored once and for all in centralized data dictionaries.