WITH dataset AS (
SELECT
CAST('{ "traceId": "abc",
 "locale": "en_US", "content": { "contentType": "PB", "content": "T S", "bP": { "mD": { "S R": "3" }, "cType": "T_S", "sType": "unknown-s", "bTimestamp": 0, "title": "T S" } } }' AS STRING) AS some_string
)
SELECT some_string, get_json_object(dataset.some_string, '$.bP') FROM dataset