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 I know the JSON-field is a String?