Can't use $unescape($column) in SELECT request when $column is multiple-value variable

[wordsappadmin]

Plugin has example in Show Help:

$unescape - unescapes variable value by removing single quotes.
Used for multiple-value string variables: "SELECT $unescape($column) FROM requests WHERE $unescape($column) = 5"

When $column is multiple value variable this example don't work.

Usecase 1
$column is multiple-value variable with value 'id'

#Template
SELECT $unescape($column) FROM requests WHERE $unescape($column) = 5
#Generated SQL
SELECT [id] FROM requests WHERE [id] = 5

Usecase 2
$columns is multiple-value variable with two values: 'date', 'id'

#Template
SELECT $unescape($columns) FROM requests
#Generated SQL
SELECT [date,id] FROM requests

The question is how to remove brackets [] from multiple-value variable?

Grafana v7.1.0 (8101355285)
vertamedia-clickhouse-datasource 2.0.2

[Slach]

simple workaround
use ${columns:csv}
instead of $unescape($columns)