Minecraft 1.16.5 Forge 36.2.35 PropertyModifier 0.6.4

I follow the comment in the config file "propertymodifier - common.toml",

according to the comment:
enchantedbook: buyItem1;[buyItem2;buyItemCount2;]enchantment[;level] - enchantment to use (e. g. minecraft:sharpness, supports regex), level for the level (randomly selected if not stated). Outputs an enchanted book, at which the amount of buyItem1 is scaled - a lvl 5 book costs approx. 5 times more than a lvl 1 book. Adding more than one enchantment is impossible

I use

villager_1_trades = ["minecraft:librarian;12;2;0.05;enchantedbook;minecraft:emerald;minecraft:sharpness;20"]

Villagers will provide sharpness 20 ON the book not IN the book, which means item "minecraft:enchanted_book" have nbt Enchantments:[] instead of StoredEnchantments:[], it makes that enchanted book cannot apply on weapon but can use the book as a weapon.
And the amount of buyItem1 is not scaled and it's always 1.