Most TFC inventory containers could conceivably be populated by loot tables (large vessels, chests, etc.) Some requirements:

• need to be unpacked if we think the container may be accessed at all by a non-spectator (even an isEmpty check)
• need to be loaded/saved in the nbt of the BE
• after this, can only be used if either you use a custom structure pieces class that loads a builtin loot table, or you save a structure nbt file with a chest that you /setblock to have the loot table ID encoded

See RandomizableContainerBlockEntity