Grafana v7.5.3 (3e3cf4dc60) Unable to add alert label data to alert notification

I added the tag {SLB}, but the ID of SLB is not displayed in the callback dat {\"dashboardId\":218,\"evalMatches\":[{\"value\":null,\"metric\":\"pv\",\"tags\":null},{\"value\":null,\"metric\":\"uv\",\"tags\":null}],\"message\":\"{slb}",“orgId”:1,“panelId”:18,“ruleId”:3,“ruleName”:“test alert”,“ruleUrl”:“http://localhost:3000/d/YA8WvB6Gz/uxiang-jia-slbri-zhi-hui-zong-ce-shi?tab=alert\u0026viewPanel=18\u0026orgId=1",“state”:“alerting”,“tags”:{},“title”:"[Alerting] test alert”}