ORM: Generation of 'formula' parameter in xml property tag of .hbm file

Please help me to specify attribute property in ORM so that it generates ‘formula’ instead of ‘column’ parameter in xml property of generated .hbm files

e.g.
need to generate something like FOLLOWING from ORM

<property name=“rowNum” formula=“ROWNUM” type=“integer”>

              <meta attribute="field-description">

Hello user,

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Best regards,
Jick