I am trying to add loot to the loot table of the Chaos Guardian using CraftTweaker & LootTweaker. I populated all loot tables into a dump file via a command in LootTweaker and I noticed that Draconic Evolution does not provide any loot tables to modify. If anyone knows if there is another way to add loot, please help me.

The Chaos Guardian does not have a loot table because it doesn't spawn loot.

Closing issue as I personally found a work-around

The Ender Dragon has a loot table, it does not spawn loot either.

The Ender Dragon only has a loot table specifically because Mojang added it due to people complaining that they were not able to add custom loot.

The Chaos Guardian handles all of that via listening for a mob death event, checking if the mob was the guardian dying, then performing any after death actions.

No need for the hostility... I was just saying that the current version doesn't provide something for you to edit. You did not ask for anything to be changed, you only asked if someone knows about a workaround.

GitHub issues isn't the place to ask questions; it's a place to report bugs. If you want to ask a question, there's a Discord server for Brandon's mods you can join and ask questions on. Maybe if you had asked if a loot table could be added, I would have responded the way you wanted.