How do you add a talent category via add-on?

[GlitchyVirus]

I'm trying to give Shadowblades access to the Poison tree, but even though it seems like I've done everything right, it's still not showing up. Am I missing something here?

The code I have is:

local Particles = require "engine.Particles"

getBirthDescriptor("subclass", "Shadowblade").talents_types["cunning/poisons"]={false, 0.3}

-This is located in \data\birth\classes\rogue.lua of my add-on

-data is set to true in the init.lua

-If it matters, I've been able to make changes to prodigies successfully with no problems

I appreciate any help that can be offered. Thank you!