Oracle 18c

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DECLARE
    TYPE MyType IS TABLE OF VARCHAR2(10) INDEX BY VARCHAR2(10);

    FUNCTION TestFunction(Input IN MyType) RETURN NUMBER
    IS
    BEGIN
        RETURN Input.Count;
    END;
BEGIN
    DBMS_OUTPUT.put_line(TestFunction(MyType('Ind1' => 1, 'Ind2' => 2)));
END;
/
1 rows affected

dbms_output:
2

CREATE OR REPLACE TYPE MyType is varray(10) of integer;
SELECT *
FROM MyType(1,2,3);


COLUMN_VALUE


1

2

3


CREATE  FUNCTION MyFunc(Input IN MyType DEFAULT MyType(1,2,3)) 
RETURN NUMBER
IS
BEGIN
   RETURN Input.Count;
END;
//
SELECT MyFunc FROM dual;


MYFUNC


3