Use alert labels in the custom_graph_enricher graph_title

[v2nek]

Is your feature request related to a problem?
It is not possible to use alert labels in the graph_title

Describe the solution you'd like
I'd like it to be templated into the final image of the custom_graph_enricher

Describe alternatives you've considered

Additional context

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[Sheeproid]

@v2nek , I'm rephrasing this a bit, please let me know if it's what you meant

Today, the custom_graph_enricher action send a graph image to Slack. This graph image has a title, set by graph_title.
You'd like to use a templating mechanism that uses the alert label, for example if I have a Prometheus alert label named instance: 192.168.81.193:8080 I'll be able to use it $instance

customPlaybooks:
- actions:
  - custom_graph_enricher:
      graph_title: CPU Usage for this nod with instance $instance,
      prometheus_additional_labels: 'cluster: ''cluster-2-test''env: ''prod'''
      prometheus_auth: Basic YWRtaW46cGFzc3dvcmQ=
      prometheus_url: http://prometheus-k8s.monitoring.svc.cluster.local:9090
      prometheus_url_query_string: demo-query=example-data
      promql_query: instance:node_cpu_utilisation:rate5m{job="node-exporter", instance=~"$node_internal_ip:[0-9]+",
        cluster=""} != 0
  triggers:
  - on_prometheus_alert: {}