[CONNECT C++] Add Formatting to a Report Column

The SDK example Annotations\ReportsExample shows how to create a report definition programmatically: create a set of ColumnDefinitionNodes...

ColumnDefinitionNodePtr columnNode = groupNode.CreateColumnDefinition (columnName, -1);
ReportColumnAccessorList accessors;
accessors.push_back (ReportColumnAccessor (QualifiedECAccessor (schemaName, className, accessString)));
columnNode->SetAccessors (accessors);

What is not shown, and what I can't find mentioned in MicroStationAPI help, is how to apply formatting to a report column.