Grafana 7.5.16 Alert notification template

We are using Grafana version 7.5.16. We have created a metrics using following Query
sum(artemis_message_count{ActiveMQArtemis=“xyz”,namespace=“abcd”,queue=“q1”}). Now in the alert notification message we want to refer the queue name when an alert is generated and a message is sent to any of the channels. Following is the message in the notifications section of Alert Tab : "Following queue contain unprocessed message which exceeds its configured threshold of 1,
${queue}"
When an alert is raised we want to send a message “Following queue contain unprocessed message which exceeds its configured threshold of 1”: q1 : value. But its not working as expected. It just sends a message Following queue contain unprocessed message which exceeds its configured threshold of 1": value. the queue name is missing.

We have followed the steps from the url Alert notification templating | Grafana documentation

Any help would be much appreciated.

Thanks