PostgreSQL join json columns - postgresql

Question

I am trying to write sql query to perform this task - combine all plans.features into one (if amount_images is present in both columns they should sum up, if one feature is present in one plan but not in other it should exist in output, if in one feature is marked as false and in other as true it should be true in output). Maybe that's too complicated but I would like to know the answer, here are the migrations
create table plans (
id serial unique primary key not null,
is_init boolean not null,
price int not null,
plan_name varchar not null,
plan_description varchar not null,
features jsonb not null,
is_deprecated boolean not null default false,
created_at timestamp with time zone not null default now()
);
create table payments(
id varchar unique primary key,
session_id varchar null,
payment_intent_id varchar null,
amount_paid bigint null,
promocode_id varchar null,
email varchar null,
plan_id int not null references plans(id),
version_id varchar null references versions(id),
created_at timestamp with time zone not null,
paid_at timestamp with time zone null
);
Here is query that I use to get features for specific version, but I have no idea what to do next, thanks
SELECT json_agg(plans.features)
FROM payments
INNER JOIN plans ON payments.plan_id = plans.id
WHERE payments.version_id='1'
AND payments.paid_at is not null
Example plans
INSERT INTO plans (is_init, price, plan_name, plan_description, features) VALUES (
true, 1300, 'test', 'yeeeeeeah',
'{
"amount_images": 100,
"upscale_limit": 0,
"help": false
}'
);
INSERT INTO plans (is_init, price, plan_name, plan_description, features) VALUES (
true, 1300, 'test2', 'yeeeeeeah2',
'{
"amount_images": 10,
"upscale_limit": 500,
"help": true
}'
);