Anubis for multiple SNI backends behind HaProxy

[xkpx64]

Hey awesome service !
As of my understanding anubis can only redirect to one backend per anubis service.
In my case i have haproxy with SNI offloading with multiple backends , some private and some public.

Is it possible and how to make anubis to cover only specific backends but with one service of it.?

export BIND=:8923
export BIND_NETWORK=unix
export DIFFICULTY=4
export METRICS_BIND=:9090
export SERVE_ROBOTS_TXT=0
export TARGET=https://domain1.com, https://domain2.com