Okay after another test drive I can quite surely say the sound is coming from the passenger side rear wheel area, so I guess that rules out the giubo. Also filmed a short video of the sound where I accelerate from the stop to about 25 mph (40 kmh). As you can see the noise fades away when the speed increases and comes back when I let off the gas and let the car slow down. With a tape marking the spot, I was able to see that the noise occurs usually once per revolution of the wheel.
https://youtu.be/WfXYyW-WbTs