net/haproxy: integration with crowdsec plugin

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Hi. I searched and could not find this question.
I want to use the haproxy_spoa engine from crowdsec. To do it, I need to create a .conf to be read in by haproxy when it reads its own haproxy.conf at start/restart.

haproxy documentation says it is possible to use multiple -f when starting haproxy however to me it seems it is better, as in less complicated, to plumb it into the haproxy plugin, to find a way to make the reference into the current haproxy.conf
How can I do this? So far I've been unable to by using the +TARGET template from the opnsense documentation. Probably because I don't know where to place the new .conf file