Is there anything that increases specific elemental damages for minions?

So I'm looking at the Primalist companions, and there's basically a way to "convert" the companions to lots of different elemental damage types, but are there items / affixes that boost this?

Or are the affixes and damage modifiers on items just "Minion damage"?

For usual Elemental damage types when it's your own you'd wanna focus on 1 element so you dont have to spread out your affixes, but not sure if this is the case for the companions

-Asking because I want to know if I'd completely gimp myself if I for example go for Ice Wolves, Frost Crow and a Physical Bear for example