Identify if an firing alert is repeated

What did you do?
Trying to identify a repeated alert in a message template
What did you expect to see?
Repeated: Alert_title
What did you see instead? Under which circumstances?
Alert_title
Environment
Linux

• System information:
  Linux 5.4.0-107-generic
• Alertmanager version:
  alertmanager, version 0.24.0 (branch: HEAD, revision: f484b17fa3c583ed1b2c8bbcec20ba1db2aa5f11)
  build user: root@265f14f5c6fc
  build date: 20220325-09:31:33
  go version: go1.17.8
  platform: linux/amd64
• Prometheus version:
  prometheus, version 2.34.0 (branch: HEAD, revision: 881111fec4332c33094a6fb2680c71fffc427275)
  build user: root@121ad7ea5487
  build date: 20220315-15:18:00
  go version: go1.17.8
  platform: linux/amd64

I'm trying to find a way to tell if a firing alert is a repeated one. Why I want this is because it would be nice to output this information in for example Slack so we know if the alert is new or repeated, eg inside the timeframe of repeat_interval setting.

I was hoping this would be available in the .Status data however it seems like that can only contain "firing" or "resolved".

Would this be possible to implement somehow or is it already available?

The issue does not name a source file or test. Start by tracing how Alertmanager builds notification template data, focusing on .Status, firing alerts, and repeat_interval; done means a template can distinguish new from repeated firing alerts and render that information in Slack.