Creating an alert rule for every new Deadletters in service bus

I'm trying to create a new alert rule that will send an email every time a new dead letter appears in my topics in the service bus.

Initially, I tried searching for a solution at the subscription level so I could choose which subscriber to monitor for each topic, but I couldn't manage to set it up (is this possible? I tried querying).

After that, I realized there is a default condition I can use, which triggers an alert whenever there are more than x dead letters (in my case, 1). This worked at first, but then I noticed that the alert triggers only once when the threshold is exceeded. For example, if I get a new dead letter (let's say the third one), it does not trigger another alert, even though (and because actually) the count is still above the threshold. Unfortunately, I can’t reset it immediately every time.

So:

Is there a way to make the alert trigger for every single new dead letter?

Is there a way to configure the rule at the subscription level rather than just at the topic level?

Thank you very much!