Currently creating some races for an upcoming game. Trying to create a race trait that provides the player with proficiency in all weapons that have the Thrown or Ammunition properties (or simply just all range weapons) except firearms.

Currently, unless I'm missing something, the only way for me to do this is to have individual modifiers within the trait adding each weapon separately.

I've tried the modifier Proficiency - Ranged Attacks, though this doesn't seem to affect weapons.

Any suggestions?

I do not think there is a way to assign proficiency by weapon property. Everything official is either all simple, all martial, or these specific weapons, and the homebrew tools were built off of supporting only what modifiers the official content needed.

I think you have to add each weapon individually.