Return MBR result as 5 point polygon in spatial Oracle 12.1 database with 3D objects

We need an MBR, but it needs to be returned as a 5 point polygon.

Test sample :

with OrientedPoint as
   (
      SELECT 1 AS OrientedPoint, sdo_geometry(3001,31370,NULL,sdo_elem_info_array(1,1,1,4,1,0),sdo_ordinate_array(1,11,0,1,0,0))  AS geom FROM dual union all
      SELECT 2 AS OrientedPoint, sdo_geometry(3001,31370,NULL,sdo_elem_info_array(1,1,1,4,1,0),sdo_ordinate_array(2,12,0,1,0,0))  AS geom FROM dual union all
      SELECT 3 AS OrientedPoint, sdo_geometry(3001,31370,NULL,sdo_elem_info_array(1,1,1,4,1,0),sdo_ordinate_array(3,13,0,1,0,0))  AS geom FROM dual union all
      SELECT 4 AS OrientedPoint, sdo_geometry(3001,31370,NULL,sdo_elem_info_array(1,1,1,4,1,0),sdo_ordinate_array(4,14,0,1,0,0))  AS geom FROM dual union all
      SELECT 5 AS OrientedPoint, sdo_geometry(3001,31370,NULL,sdo_elem_info_array(1,1,1,4,1,0),sdo_ordinate_array(5,15,0,1,0,0))  AS geom FROM dual union all
      SELECT 6 AS OrientedPoint, sdo_geometry(3001,31370,NULL,sdo_elem_info_array(1,1,1,4,1,0),sdo_ordinate_array(11,21,0,1,0,0)) AS geom FROM dual union all
      SELECT 7 AS OrientedPoint, sdo_geometry(3001,31370,NULL,sdo_elem_info_array(1,1,1,4,1,0),sdo_ordinate_array(11,31,0,1,0,0)) AS geom FROM dual union all
      SELECT 8 AS OrientedPoint, sdo_geometry(3001,31370,NULL,sdo_elem_info_array(1,1,1,4,1,0),sdo_ordinate_array(15,21,0,1,0,0)) AS geom FROM dual union all
      SELECT 9 AS OrientedPoint, sdo_geometry(3001,31370,NULL,sdo_elem_info_array(1,1,1,4,1,0),sdo_ordinate_array(15,31,0,1,0,0)) AS geom FROM dual
   ),
   
     Area as
   (
      SELECT 1 AS Area, 'Area 1' AS name FROM dual union all
      SELECT 2 AS Area, 'Area 3' AS name FROM dual union all
      SELECT 3 AS Area, 'Area 3' AS name FROM dual
   ),

     Rel as
   (
      SELECT 1 AS id, 2 AS OrientedPoint, 1 as Area FROM dual union all
      SELECT 2 AS id, 3 AS OrientedPoint, 1 as Area FROM dual union all
      SELECT 3 AS id, 4 AS OrientedPoint, 2 as Area FROM dual union all
      SELECT 4 AS id, 5 AS OrientedPoint, 2 as Area FROM dual union all
      SELECT 5 AS id, 6 AS OrientedPoint, 3 as Area FROM dual union all
      SELECT 6 AS id, 7 AS OrientedPoint, 3 as Area FROM dual union all
      SELECT 7 AS id, 8 AS OrientedPoint, 3 as Area FROM dual union all
      SELECT 8 AS id, 9 AS OrientedPoint, 3 as Area FROM dual
   )
   
   
select
   a.Area,
   SDO_AGGR_MBR(SDO_UTIL.EXTRACT(p.geom, 1)) geom
from
   Area a
   inner join Rel r             on r.Area          = a.Area
   inner join OrientedPoint p   on p.OrientedPoint = r.OrientedPoint
where
   a.Area = 3
group by
   a.Area;


The result returned looks like this :
   SELECT 3 AS Area, sdo_geometry(3002, 31370, NULL, sdo_elem_info_array(1, 2, 1), sdo_ordinate_array(11,21,0, 15,31,0))  AS geom FROM dual;

But we need it to look like this :
   SELECT 3 AS Area, sdo_geometry(3003, 31370, NULL, sdo_elem_info_array(1, 1003, 1), sdo_ordinate_array(15,21,0, 15,31,0, 11,31,0, 11,21,0, 15,21,0))  AS geom FROM dual;

What's the best way to achieve thos in Oracle 12.1

Regards,
Ivan