Man pages matching name bson_utf8_escape_for_json in section 3:

bson_utf8_escape_for_json.3.en	debian 10 / libbson-doc
bson_utf8_escape_for_json.3.en	debian 11 / libbson-doc
bson_utf8_escape_for_json.3.en	debian 12 / libbson-doc