Generating item modifiers containing multiple loot functions

[DJChaos42]

Description

I have created a datagen class which allows me to generate vanilla item modifiers, but am running into issues recreating some things which are possible when writing the .json files manually. For example, the following item modifier contains two loot functions

Multiple Function .json example

[
  {
  	"function": "minecraft:set_name",
  	"target": "item_name",
  	"name": "\"foo\""
  },
  {
  	"function": "minecraft:set_damage",
  	"damage": 1
  }
]

So far I have only been able to figure out how to generate modifiers which contain a single loot function, but I want to be able to generate one which matches the above example.

I have provided my current datagen class below to give an example of what I have been able to get working so far.

Item Modifier Datagen class

public class ExampleItemModifierProvider extends FabricCodecDataProvider<LootItemFunction> {

  protected ExampleItemModifierProvider(FabricDataOutput dataOutput, CompletableFuture<HolderLookup.Provider> registriesFuture) {
      super(dataOutput, registriesFuture, Registries.ITEM_MODIFIER, LootItemFunctions.ROOT_CODEC);
  }

  @Override
  protected void configure(BiConsumer<ResourceLocation, LootItemFunction> provider, HolderLookup.Provider lookup) {
      
      // A working example which uses a single loot function.
      provider.accept(ResourceLocation.fromNamespaceAndPath(Constants.MOD_ID, "foo"), SetNameFunction.setName(Component.literal("foo"), SetNameFunction.Target.ITEM_NAME).build());
      
  	// An attempt to use LootItemFunctions.compose() to create the function. This one works when a single function is added, but not multiple.
      provider.accept(ResourceLocation.fromNamespaceAndPath(Constants.MOD_ID, "foo"), (LootItemFunction) LootItemFunctions.compose(ImmutableList.<LootItemFunction>builder()
              .add(SetNameFunction.setName(Component.literal("foo"), SetNameFunction.Target.ITEM_NAME).build())
              .add(SetItemDamageFunction.setDamage(ConstantValue.exactly(1)).build())
              .build()));
  }

  @Override
  public String getName() {
      return "Item Modifiers";
  }
}

Please note that my understanding of codecs is still very basic, so if the solution requires using them, an example would be appreciated.