8.14.5 jsonb subscripting

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Page: https://www.postgresql.org/docs/16/datatype-json.html
Description:

Using subscripts with square brackets is not supported, one must use -> or 
#> operators
The given examples result in error:

SELECT ('{"a": 1}'::jsonb)['a'];

-- Extract nested object value by key path
SELECT ('{"a": {"b": {"c": 1}}}'::jsonb)['a']['b']['c'];

-- Extract array element by index
SELECT ('[1, "2", null]'::jsonb)[1];