Network unreachable after adding new bridged interface

Hi @tomp
I am able to solve the bridge interface problem. now i wanted to have lxd container with static ip. and the container would be using the bridge interface br0.

Can I modify container-> ./etc/network/interfaces or netplan to set static ip which uses bridged interface br0 of host? can you share detail which i need to fill in these files?
Note - Now I am using old network configuration ./etc/network/interfaces in host machine .