How to render an item in a piglin-type entity's hand (and armor too, preferably)

Hey, I am making a boarlin mob, which shares many characteristics with piglins, including their model. I assumed armor and held items would render for them, but they don't. How can I make them render? I hope it will be easier than for custom models, since I am using a model of an entity that does render such items in vanilla. Working with MCreator 2024.3, Forge 1.20.1 btw