Getting json-value as varchar

Hi, in PG-14 this query returns "value" (with double-quotes): 
SELECT ('{"key":"value"}'::jsonb)['key']; 
 ┌─────────┐
 │ jsonb │
 ├─────────┤
 │ "value" │
 └─────────┘
 (1 row)


and this returns 'value' (without the quotes): 
SELECT ('{"key":"value"}'::jsonb)->> 'key'; 
 ┌──────────┐
 │ ?column? │
 ├──────────┤
 │ value │
 └──────────┘
 (1 row)

 How to I use the subscript syntax and get the result as varchar instead of 
JSONB, assuming Iknow the JSON-field is a String? 



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