as result of complicated select I have the_table with the structure like:

pl_id, date, value

I also have another table (let it calls the_source) where I have a list of all vailable pl_id.
The idea is to extend the_table with values from the_source which doesn’t exist.
The problem is that some columns must be defined exactly as expected, another – can be any (let it be 0).

CREATE TABLE the_table (
  "pl_id" INTEGER,
  "date" DATE,
  "value" INTEGER
);

INSERT INTO the_table
VALUES
  ('1', '2024-05-01', '10'),
  ('1', '2024-06-01', '11'),
  ('2', '2024-05-01', '12'),
  ('2', '2024-06-01', '13');
  

CREATE TABLE the_source (
  "pl_id" INTEGER,
  "msg" TEXT
 );
 
 INSERT INTO the_source
 VALUES
    ('1', 'aaaaa'),
    ('2', 'bbbbb'),
    ('3', 'ccccc'),
    ('4', 'ddddd');

missed records can be found by select:

select * from the_source
where not exists (
  select
    *
  from the_table
  where the_table.pl_id = the_source.pl_id)

I would like to have the_final table with folling information:

  ('1', '2024-05-01', '10'),
  ('1', '2024-06-01', '11'),
  ('2', '2024-05-01', '12'),
  ('2', '2024-06-01', '13')
  ('3', '2024-05-01', '0'),
  ('3', '2024-06-01', '0'),
  ('4', '2024-05-01', '0'),
  ('4', '2024-06-01', '0');

Is it possible realize by SQL commands?