Reading through the docs on the pod logs collector spec: Pod Logs - Troubleshoot Docs - Troubleshoot Docs
It seems you can target a namespace via namespace but you cannot target multiple namespaces, or namespaces that you may not know the name of since they could be randomly generated.
Our product is beginning to act as a kubernetes operator and will create namespaces with randomized names that we would like to be able to include in a support bundle. These namespaces are labeled appropriately, so a label selector for the namespaces label would work great for our purposes.