Is it possible to select from table of objects while using dbms_sql.native? I have defined an object:

CREATE OR REPLACE TYPE SI_O IS OBJECT(
S_ID NUMBER,
P_ID NUMBER,
G_ID NUMBER,
DLT VARCHAR2(255),
ERROR_ID NUMBER,
B_ID NUMBER
);
I also defined a table of objects:

create or replace type SI_T is table of si_o;
Now I'm trying to use it in a procedure like that:

CREATE OR REPLACE PROCEDURE NATIVE_TEST IS
sqlCommand VARCHAR2(320);
tRows SI_T;
num BINARY_INTEGER:= -1;
l_ntt_desc_tab DBMS_SQL.DESC_TAB;
cur INTEGER;
cnt INTEGER;
nrowCnt INTEGER;

BEGIN

sqlCommand :=
' SELECT SI_O(S_ID, P_ID, G_ID, DLT, error_id,B_ID) FROM MYTABLE' ;

EXECUTE IMMEDIATE sqlCommand BULK COLLECT INTO tRows ;
sqlCommand := 'select count(*) cou from table(tRows)';
-- here is what I wish:
cur := DBMS_SQL.OPEN_CURSOR;

DBMS_SQL.PARSE(cur,sqlCommand,dbms_sql.native);
nrowCnt:=DBMS_SQL.EXECUTE(cur);
DBMS_SQL.CLOSE_CURSOR(cur);
END NATIVE_TEST;
However I'm getting runtime exception ora-00904 "TROWS" invalid identifier. Everything is here simplified but I really wish to use dbms_sql.native like that ( if it would be posiible).