So, I have fastfetch installed in a Toolbx container and I have this line in my .bashrc so it only runs when a host terminal opens:
if [ ! -f /run/.containerenv ]; then toolbox run --container aesthetics-box fastfetch --logo Fedora-Sericea fi
Upper right is a shell inside a (distrobox) podman container and bottom right is a shell inside an Incus LXC.
In theory it gives me a little extra nudge to tell me where my shell is operating. 
Host OS is Fedora Sway Atomic.