Haproxy ssl-passthrough help

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Can anyone explain to me how I would setup haproxy in OPNsense to do ssl-passthrough instead of offloading?

I currently have a single public ip listening on 443 via haproxy with certainty for a couple of servers/services added to it with ssl offloading configured. There are rules that look at host contains and based on the sub domain name of the url, they are routed to the proper pool of servers.

This is currently working for me.

I am more curious on how I would do this with ssl-passthrough instead of offloading and also how I could still use rules to determine which server pool a sub domain url hits.

Any guidance would be much appreciated.