Documentation of SQL statement.type in Nifi PutDatabaseRecord

Does anyone have experience using SQL value in statement.type for PutDatabaseRecord processor in Nifi?

It is undocumented as to how to format/parameterize this query correctly.  Use of ? or record path values both fail e.g.

INSERT INTO radius.sim_usage(id,sim_id,"ICCID",sim_month,sim_usage,"updatedAt",supplier_id)
VALUES(/id,/sim_id,/iccid,/sim_month,/sim_usage,/updatedAt,/supplier_id)
ON CONFLICT(id)
DO UPDATE SET
sim_usage =
CASE WHEN sim_month <> '${nowDate}'
THEN sim_usage = sim_usage - /sim_usage
ELSE sim_usage = /sim_usage
END

INSERT INTO radius.sim_usage(id,sim_id,"ICCID",sim_month,sim_usage,"updatedAt",supplier_id)
VALUES(?,?,?,?,?,?,?)
ON CONFLICT(id)
DO UPDATE SET
sim_usage =
CASE WHEN sim_month <> '${nowDate}'
THEN sim_usage = sim_usage - ?
ELSE sim_usage = ?
END