I have the lootbags mod, and it has the option to add items to the loodbag drop list

it has a section within its config that shows the loot tables from vanilla Minecraft that the mod draws from.

for example:
minecraft:chests/simple_dungeon
minecraft:chests/abandoned_mineshaft
minecraft:chests/desert_pyramid
minecraft:chests/jungle_temple

if I knew what the loot tables for chests within the medium, or chests within the medium's dungeons are called, I would simply just have to copy and paste their tags into lootbag's config file.

I'd greatly appreciate it if someone would give me these tags.

The only chest type of loot as of right now goes by the name

minestuck:chests/medium_basic

For reference, you can find all existing loot tables in
https://github.com/mraof/Minestuck/blob/1.12/src/com/mraof/minestuck/world/storage/loot/MinestuckLoot.java

Do note however that the consort loot tables use a consort predicate for most items, so a lot of those items will be unlikely to show up.