Creating item for Sharpshooter

For one character I was able to make an item to represent a character's +3 RAGE and GWF -5 to hit and +10 damage.

I have another character that uses DARTS and I am unable to create an item to allow -5 to hit and +10 damage when using darts.

HELP

You don’t need to create a homebrew for that. Simply add another instance of a dart to your character sheet and modify it directly by customizing it. That way you will have the option of whether or not to use sharpshooter. Like this: