Notification to RAK 19003

Since I can only choose standard notification sounds on the iOS app (no problem on Android, I can play any siren),
I’m looking for a way to generate a notification sound that is as audible as possible on a RAK19003 base board when a message arrives.
What components do I need besides an active or passive buzzer (PWM) and how do I implement this in Meshtastic?

I got at least one LED to work on a Heltec V3, buzzers only cracked a little.
Thanks for any input :+1: