How to connect a Docker container to lxdfan0 bridge

Hello. I have a cluster with a lot of LXD containers. Containers are running on different host machines. And I have a couple of Docker containers. I want to have an access by network from some LXD container situated on host A to some Docker container situated on host B without port forwarding. I think that one of solutions is to connect Docker containers to LXD Fan Network (lxdfan0 bridge). Was these scheme implemented by anyone? I’m lokking for real cases or your thoughts about it.

Why can’t host A access the Docker containers today? Is there no route from host A to the Docker containers and back, or is the access blocked in firewalls?