You can add a string field to your class and use the Forward mapping wizard to specify the column data type for this field. You can select 'LONGVARCHAR' as the 'TYPE' and the desired sql type - text,ntext etc
The mapping for the field would like the following
<extension key="db-type" value="LONGVARCHAR" />
<extension key="db-sql-type" value="NTEXT" />
The column will be created when you build the project.
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