Feature request name
Nested Tags Support

Feature request description
Support for nested tags, such as such as tag:forge:sand/red

Feature request reason
Many mods, and Forge, use nested tags when there are multiple groups of items. For instance, forge has tags for all ingots, and all ingots of a certain type:

• forge:ingots
• forge:ingots/iron
• forge:ingots/gold
• forge:ingots/copper

and so on.

Feature request dependencies
None, as far as I can tell

This already works...?

<tag:forge:ingots>
<tag:forge:ingots/iron>
<tag:forge:ingots/gold>
<tag:forge:ingots/copper>

I haven't tested this myself, but I know that someone has added a new tag under the forge group

My apologies, this is a different issue I improperly assumed wasn't working because of nested tags. I will be updating this issue

I was trying to add a tag to a tag (i.e) <tag:forge:beacon_payment>.addItems([<tag:forge:gems>]);
as vanilla can do something similar

{
  "replace": false,
  "values": [
    "#forge:gems"
  ]
}

but on second thought I can iterate all items with that tag like so:

for item in <tag:forge:gems>.items {
   <tag:forge:beacon_payment>.addItems(item);
}

Sorry for the trouble.