Homebrew magic item not conferring natural weapon attacks

I'm trying to create a homebrew "magic item" to implement a lycanthropic curse. Some aspects of the "item" are working, including resetting the PC's Strength and conferring advantage on Perception checks. However, it's also supposed to confer natural weapon attacks, but these aren't appearing on the Actions page. I'm using the Natural Weapons modifiers to provide these attacks. Is this the correct way to do it, or no?

I'm pretty sure that modifier is intended for use with homebrew species traits. Homebrew items in general aren't capable of adding actions to the character sheet.