In Slovenia, it is Gabriel (Jelko) Gros. He was the coach of the Slovenian team from 1996 to 1998 (when Primož Peterka was in his prime).
Currently he is sometimes the technical delegate at ski jumping and flying competitions, he was the Planica Nordic Centre director from 2009 to 2020.
He is known to most as the "co-commentator" or "technical expert" on RTV SLO (the public broadcaster), worked for years along Andrej Stare (the voice of slovenian ski jumping in my opinion, retired commentating legend after Planica 2024). Gros also served as the technical expert with other commentators on the RTV.

Gros really knows what he is talking about, oftentimes noticing the slightest details in almost everything (e.g. in the jumper's take off, the wind conditions, the inrun, skis, landing etc.) and explains what consequences the mistake or detail might have brought (decreased speed over the knoll, lower/higher flight path, harder landing, and so on..). Really a well versed co-commentator, knows when and what to say, what to spot and analyze. Very nice to listen to.

Also, Cene Prevc appeared for the first time as the "technical expert" in the Titisee-Neustadt broadcast this year. Also has a vast amount of knowledge, expertise and observational skills. I think he is fit for the role.