According to 5.19 Minions “Modifiers your character has (such as from passives and items) will not apply unless minions are specified.”
So in general, the affix would have to say “increased area for melee minions” or something like that. AFAIK no affix like that exists.
Manifest Armor is special, because it should gain stats from your armor (and from your weapon if you have the Titan Sword node), but I couldn’t find any information about which stats exactly are getting transferred. I mention this because this post Question about Manifest Armor stats taken from my gear - #13 by greenwater2642 says that not all stats are actually transferred.