Specify Subscription ID for event instead of topic

[shpml]

Is it possible to provide a pub/sub subscription id instead of a topic when configuring and event trigger?

Right now for an event trigger type I specify a pub/sub topic. The subscription gets created automatically but I'm not able to enable dead lettering or specify a deadletter queue along with other useful settings.

Alternatively is it possible to specify these details within serverless.yml?