Grana PostgreSQL Alert Can't Read Array {pq:(Syntax error at or near "["}

Hello Grafana Community!

When I tried to configure Grafana OpenBMP alert using query like
$__timeFilter(interval_time) and asn = [[asn_num]]

I got error that the alert cannot read array [[asn_num]] like this:

But when I change to manual input like asn = 3356, the alert works well.

It’s using [[asn_num]] so it can adapt with the input ASN like figure below

Is there any way so the alert can work? Thanks.