Analysis of Conditions with no results and high offset number - PostgreSQL JSONB

I am asked to record down the analysis on PostgreSQL JSONB query having Conditions with high offset number and query that provide no results considering the below.

select
    *
from
    sub_test df,
    jsonb_array_elements(json_data) jba
where
    (jba->>'name')::text = 'SubYear'
    and (jba->>'value')::numeric > '2050';

1. SubYear > 2200 (has no results) Explanations about the query plan, are full scans of tables necessary with JSON? 2. SubYear > 1970 (has a lot of results) and offset 30k Explanations about the query plan, are full scans of tables necessary with JSON? Note that there are about 35k+ records in the table "sub_test" with 500+ keys in the JSONB column "json_data" Could you help me to answer them ?