SQL & PL/SQL

Hello,
Oracle 12c.
I have to select from a collection of values returned from a function:

select * from mytable
where myfield member of x_test.getList;

The problem is that I get the ORA-00902: invalid datatype error.
Following is what I did:

CREATE OR REPLACE PACKAGE x_test AS
    type myList IS TABLE OF VARCHAR2(6);
END x_test;


CREATE OR REPLACE PACKAGE BODY x_test as

function getList return myList is
  v1 myList;
begin
 SELECT Nickname bulk collect INTO v1
 FROM SoftwareTable
 where DateLic > trunc(sysdate)-90;
 /** this is just an example. Actually the query is more complex, thus I dont want to 
     directly incapsulate it into the IN clause of the calling select statement **/

return v1;
end getList;

END x_test;

How can I select from mytable by filtering only whose records where myfield is in the list of values returned by the myList function?
Thank you!!