Is there any way to call my custom hook after slack acknowledge button pressed?

In amixr we had an integration: calling hook after acknowledge button in slack was pressed. After migrating to grafana onCall we noticed that it’s integration was broken.
I’ve been looking for fix that, but can’t find it in documentation.
So is it possible to make it in grafana onCall?

Thanks a lot!

So, there is a bug ack_url_post and ack_url_get don't work · Issue #371 · grafana/oncall · GitHub