declare 
  type TTI is table of int; 
  i integer;
  var TTI := TTI();
begin 
  var.extend;  
  select var(T.dummy)
  into i
  from (select 1 DUMMY from dual) T; 
end;

  select var(T.dummy)
  into i
  from (select 1 DUMMY from dual) T; 

  select :B1
  into i
  from (select 1 DUMMY from dual) T; 

SQL> declare 
  2    type TTI is table of int; 
  3    i integer;
  4    var TTI := TTI();
  5  begin 
  6    var.extend;  
  7    select T.dummy
  8    into i
  9    from (select 1 DUMMY from dual) T; 
 10    i := var(i);
 11  end;
 12  /

PL/SQL procedure successfully completed.

SQL> 

declare 
  type TTI is table of int; 
  i integer;
  var TTI := TTI();
begin
 
  var.extend;
  
  select p_MyProc.m_MyFunc(T.dummy)
  into i
  from (select 1 DUMMY from dual) T;
 
end;