Notify workflows when PR is merged

[ksudate]

Is your feature request related to a problem? Please describe.

Hello. Is it possible to set up a workflow notification when a PR is merge? Perhaps now it is possible to select pull_request in event but not Activity types.

/github subscribe org/repo workflows:{event:"pull_request","push" branch:"main","dev" actor:"ashokirla"}

Describe the solution you'd like

Add configuration like

/github subscribe org/repo workflows:{event:"pull_request",type:"merged","push" branch:"main","dev" actor:"ashokirla"}

Describe alternatives you've considered

Additional context