PostgreSql Traverse through an array to fetch results in multiple rows under same column

Use jsonb_array_elements() or json_array_elements(), e.g.:

with the_data (json) as (
    values (
        '{"group_nw4qu40":[
        {"group_nw4qu40/Special_Characteristics":"11"},
        {"group_nw4qu40/Special_Characteristics":"0"},
        {"group_nw4qu40/Special_Characteristics":"0"},
        {"group_nw4qu40/Special_Characteristics":"1"},
        {"group_nw4qu40/Special_Characteristics":"1"}]}'::jsonb)
    )
select e->>'group_nw4qu40/Special_Characteristics' value_of_special_characteristic
from the_data, jsonb_array_elements(json->'group_nw4qu40') e

 value_of_special_characteristic 
---------------------------------
 11
 0
 0
 1
 1
(5 rows)

Your actual query should look like this:

select id, e->>'group_nw4qu40/Special_Characteristics' value_of_special_characteristic
from public.logger_instance, jsonb_array_elements(json->'group_nw4qu40') e 
where id = 5215;