Help with Moon Animator 2 Mod

I’m trying to make the child of constraint from blender and implementing that in moon animator and what I have so far is the part sticking to the right arm without any offset (the part’s actual joint is in the torso):


Now the problem I’m trying to solve is how would I apply this offset while being pivoted to the right arm like this:

Edit: Here’s the script I’m currently using BTW

local char = workspace:FindFirstChild("YotsunaCS")
local tool = workspace:FindFirstChild("Part")

local targetjoint = char.Torso["Right Shoulder"]
local affectedjoint = char.Torso["ToolWeld"]

while task.wait() do
	local targettransform = targetjoint.C1*targetjoint.C0:Inverse()
	affectedjoint.C1 = targettransform
end

Any help is appreciated thx