Grafana Alert - Webhook : sending query variable and query value

I am monitoring cisco device using grafana.
(snmp data from cisco is sent to elastic search and from elastic search we fetch the data for grafana).

I want to create an alert in grafana - whenever a metric (say interface traffic threshold) exceeds a value, alert should be triggered.

I want to send this alert using webhook notification.

While sending this alert notification via webhook, I would like to send the value of the traffic rate, host name , interface name, time this alert got triggered and some more user defined variable(hardcoded one) like some name and a value to it (like network=gns).

Could you please help in creating an alert in grafana for above usecase?