ExecuteSQLRecord with CSVRecordSetWriter : Value Separator not supported Expression Language

In a CSVRecordSetWriter Controller Service, the parameter "Value Separator" is set using Expression Language like ${delimiter} (where delimiter is defined as "|").

When I use this Controller Service with ConvertRecord, everything works, my csv file is "|" separator.

However, when I use the same Controller Service with ExecuteSQLRecord, the Value Separator is set to the default value "," and there is this message in the nifi-app.log :

WARN [Timer-Driven Process Thread-5] org.apache.nifi.csv.CSVUtils 'Value Separator' property evaluated to an invalid value: "". It must be a single character. The property value will be ignored.

It seems that the Expression Language is not supported with ExecuteSQLRecord.