The items_v6.json doesn't seem to have an enable/disable option for server config and simply regenerates to default values on server restart.
Is this intended? The mod info page says there should be a config somewhere.

There is no method for disabling individual items, as it breaks registry integrity between server and clients in an unresolvable manner.

Ah okay, question then.
If i remove certain jewlery in data/rpg/_series/tags/item/tier_3_accessories.json and both my server and client have the edited jar would that accomplish removing certain jewelry?

Thanks!

No, item tags are just for categorization. This tag is only is primarily used by loot injection.

I recommend trying the Item Obliterator mod. Make sure client and server have the same config.

For further discussion, please the Discord server linked to every mod page.