Displaying multiple instances name in summary of alert

Alert Config

Webhook Config

Hi, How do i display multiple firing instances name of threshold alert in summary of alert. Using the configurations above i only get single instance/node name in webhook message and if more than one instance is firing then nothing is displayed.

Can anyone help please? i have been struggling with this issue for quite sometime now and it is literally the only thing holding me back from implementing this on production

Summary shows the name of all nodes as expected but its just that when i try to print it in webhook message. If only single nodename/instance is firing then its displayed otherwise the message body is empty.