How to split value of label on few rows

Hi.
I am trying to put some alerts into description. I’ve created variable $Alerts, which contain labels “alertname”. I’ve specifiied $Alerts in description but all variables are in one row. I want to split it. Is it possible to do via rexeg for example? By the way I use prometheus.

image

I wanna do something like this:
Rules:
Vmware: VM has disk space less than 15% for 1h
Vmware: VM has disk space less than 5% for 1m