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SELECT
     folio_users.users__.id,
     jsonb_extract_path_text (users__ .jsonb, 'personal', 'lastName') AS requestor_last_name,
     jsonb_extract_path_text (users__ .jsonb, 'personal', 'firstName') AS requestor_first_name
FROM
     folio_users.users__

The following expression will also get "lastName" and "firstName":

SELECT
     folio_users.users__.id,
     users__ .jsonb #>> '{personal, lastName}' AS requestor_last_name,
     users__ .jsonb #>> '{personal, firstName}' AS requestor_first_name
FROM
     folio_users.users__

Extracting "Third level" Data Fields

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