Help with Villager Potion Trading

I thought I would come on here to see if anyone else knows how to do this because the way I've tried making Villagers trade potions doesn't seem to work.
I am using custom code as this isn't possible without it. Here's the section of custom code (it also has the imports imported, so it's not the fact that I don't have imports):

new PotionUtils.setPotion(new ItemStack(Items.POTION, Potions.STRONG_HEALING), 10, 5, 0.05f));

I'm not really sure what else to do here since I'm not extremely into Java coding and stuff.
So if anyone else knows and could help me out, I'd appreciate it.