Finding free time period on non-continous tstzrange field values

Hi

Given the following table, how do I find free time period.

CREATE TABLE test_time_range (
id SERIAL PRIMARY KEY,
time_range tstzrange);

Insert into test_time_range(time_range) values('[2022-11-28 08:00:00,
2022-11-28 20:00:00]');
Insert into test_time_range(time_range) values('[2022-11-29 12:30:00,
2022-11-29 22:00:00]');
Insert into test_time_range(time_range) values('[2022-11-30 05:00:00,
2022-11-30 19:00:00]');

In the above example, I would like the query to return something like this:
"2022-11-28 20:01:00 2022-11-29 11:29:00"
"2022-11-29 22:01:00 2022-11-30 04:59:00"

Apologies if this is a dumb question, but trying to use range for the first
time , and can't get my head around it.

Using PG14, can upgrade to 15 if that matters.

Amitabh