begin
  select count(*)
    into :lvCount
    from receiver
   where deleted in (select * from table(cast :lvDeleted as myTableType));
end;

In Oracle:
--Is Number in set?
create or replace type TNumbers as table of number(9);
/
create or replace function Value_In(p_Value in number, p_Set in TNumbers) return number is
  v_Result number(1) := 0;
begin
  begin
    select 1 into v_Result from dual
      where p_Value in (select * from table(p_Set));
  exception
    when NO_DATA_FOUND then null;
  end;
  return v_Result;
end;
/
//
In Delphi the PL/SQL block for TOracleDataSet component SQL property:
select * from yourtable t where Value_In(:v_ID, :v_Set) = 1;
Though you need to bind value to variables v_ID and v_Set.
To bind value to v_Set you need to use the followning code:
...
var
  v_Set: TOracleObject;
...
begin
...
  v_Set := TOracleObject.Create(orcSession, 'TNUmbers', '');
...
  v_Set.Elements[1] := 1;
  v_Set.Elements[2] := 2;
...
  orcYourTable.SetVariable('v_ID', 1);
  orcYourTable.SetComplexVariable('v_Set', v_Set);
...
end;
// :)

declare
  r number(1) := Value_In(:v_ID, :v_Set);
begin
  dbms_output.put_line(r);
end;
with the following initialization values:
Test1:
  v_ID = "1";
  v_Set = "new TNumbers(1, 2, 3)";
  Tab sheet "DBMS Output" contain "1" as a result.
Test2:
  v_ID = "1";
  v_Set = "new TNumbers(2, 3)";
  Tab sheet "DBMS Output" contain "0" as a result.