Dialogic 2 - Emitting Signals with variables as args

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Hello, beginner at Godot and Dialogic here so not sure if this is possible, but I'm trying making a sort of RPG and I wanna have the player obtain items through dialogue.

The idea I had was that when the player obtains an item, I'd emit a signal with the item ID as an arg so that I can add it to the player inventory when the signal is emitted.. But since I don't really like "magic numbers" or putting random ID numbers as args, I thought it's be good to store them in a variable and reference it from the Dialogic text editor... But It doesn't seem to be able to pass variables as args to the signal

I was thinking of something along the lines of:

[signal arg_type="dict" arg="{"id":wardrobe_normal.items.dust}"]

Where wardrobe_normal.items.dust would be the variable containing the item ID, but it doesn't seem possible... Is there any alternative?