Updating dnsmasq options with virsh net-update

I'm trying to take advantage of libvirt's support for passing through options to dnsmasq <https://libvirt.org/formatnetwork.html#elementsNamespaces>;, but I'm having trouble getting it to take effect. I have a network already created and I'm trying to use net-update to add the options, but it's not clear to me what section I should specify. By the way, is there a good way to list the available sections? I've been resorting to reading the code <https://gitlab.com/libvirt/libvirt/-/blob/18d0f2f9569edf3c26d912a7d8974a5...;. Working in a different direction, I tried using net-edit to make the changes but they seem to have been silently discarded: $ virsh -c qemu:///system net-edit crawford-libvirt-67v2h Network crawford-libvirt-67v2h XML configuration edited. $ virsh -c qemu:///system net-dumpxml crawford-libvirt-67v2h | grep --count <my changes> 0 Can anyone tell me what I'm doing wrong or how this feature was intended to be used? Thank you. -Alex