I am trying to create a row trigger (after) where I will convert all the :new values inside the row to xml and save it in another table or Queue

I am able to do it if i statically bindevery column name with :New ,but I don't want to statically mention the column names in trigger as column names may change in future

My problem is i cannot bind variables dynamically to :NEW .it gives error when i loop through columns of table and try to get :New. Column Name

create or replace TRIGGER EVAL_CHANGE_TriggerActual_Test
  AFTER INSERT OR UPDATE OR DELETE
  ON PROJ_TEST
  REFERENCING NEW AS new OLD AS old
 FOR EACH ROW
DECLARE
 p_xmldata     XMLtype;
  P_NEWROWDATA    clob;
  p_newrowxml       clob;  
   ccolumn_item  varchar(3000);
   ccolname  varchar(3000);
BEGIN
p_newrowxml:='select XMLElement("ResearchTable",';

FOR somecol IN (select  cols.column_name as str from SYS.ALL_TAB_COLS cols where upper(cols.owner)=upper('DEVenv1_CUSTOM')  and upper(cols.table_name)=upper('PROJ_TEST')   order by column_id)
  LOOP
  
   ccolumn_item:='XMLElement("'||somecol.str||'",  ' ;   
--   ccolumn_item:=CONCAT(ccolumn_item,:NEW.DESCR );     
--   This works fine when i try to add columns statically

   ccolumn_item:=CONCAT(ccolumn_item,:NEW.'||somecol.str||' );   
--   Error in the line here when i dynamically try to get value from new  
   
    p_newrowxml:=CONCAT(p_newrowxml,ccolumn_item );                              
  END LOOP;  
  
  p_newrowxml:=CONCAT(p_newrowxml,' ) from dual');
  
   DBMS_OUTPUT.PUT_LINE(p_newrowxml);  
--EXECUTE IMMEDIATE  p_newrowxml  into p_xmldata   ;
-- p_newrowdata:=p_xmldata.getClobVal();  
END;