All my virtual machine hosts are using networkd bridging to announce IPs of their vms in my network and now I just found the easiest way to configure this without manually changing any config files like I always did before.
Here is how I added a bridge br0 to my physical interface enp1s0:
sudo nmcli con add ifname br0 type bridge con-name br0
sudo nmcli con add type bridge-slave ifname enp1s0 master br0
sudo nmcli con up br0
Works already after bringing it up but to make sure nothing is mixed up I rebooted the host before using it.