See podman-network-create(1), I think the description of the --driver option should clarify this. You can use macvlan there, but in rootless operation you don't have access to the network interface of the hosts -- unless you set that up networking separately beforehand (as root), that is.
So yes, it supports rootless, but by (kernel) design, there's no magic way to bridge (no pun intended) that gap (even with macvlan).