Hello! I use many modded structures in my game, and would like to know how to make the Rings of Ascension spawn in those modded structures' chests.

Honestly, I don't know much about making datapacks. At first I figured I could edit the loot_modifiers file, and add the chests from modded structures there, but well... I'm not really sure what exactly to write for those modded structures. I also figure that I may need to change the loot tables for those mods, and well, I haven't really gotten that far since I am not so sure what I'm doing.

If any assistance could be provided, that would be much appreciated.

Thanks!

You'll have to use a DataPack to change the loot modifiers and add the modded loot tables to it.
Here is an example DataPack that contains all the loot modifiers files:
ringmodifiers.zip

You just need to edit the file for the ring you want to modify, and add the modded loot table to it.
The modded loot table name will be modid:path/to/loot/table

You can open the mod's .jar with WinRAR to see the path to the loot table.
For example, I want the Ring of Experience to be able to spawn in the Cyclops Cave from Ice and Fire.

Opening the Ice and Fire .jar with WinRAR, I can find the loot table for the Cyclops Cave in data/iceandfire/loot_tables/chest/cyclops_cave

The path will be everything after the loot_tables folder. So the loot table to insert in the loot modifier file will be iceandfire:chest/cyclops_cave

My final experience.json file will look like this:

{
  "type": "ringsofascension:rings_modifier",
  "conditions": [
    {
      "condition": "random_chance",
      "chance": 0.1
    }
  ],
  "loot_tables": [
    "minecraft:chests/spawn_bonus_chest",
    "minecraft:chests/simple_dungeon",
    "minecraft:chests/buried_treasure",
    "minecraft:chests/ruined_portal",
    "iceandfire:chest/cyclops_cave"
  ],
  "ring": "ringsofascension:ring_experience"
}

Cyclops DataPack Example:
experience_cyclops.zip

Thank you so much! Will do this and let you know how it goes!