Deeper Oceans in 2023.2

I'm trying to make an abyssal ocean biome that extends down to around y=0 or more, but I don't know how to do it, and I can't find any help online. Here is the biome .json:

{
  "has_precipitation": true,
  "temperature": 0.5,
  "downfall": 0.6,
  "effects": {
    "ambient_sound": "ambient.underwater.loop",
    "mood_sound": {
      "sound": "ambient.underwater.loop.additions.rare",
      "tick_delay": 6000,
      "offset": 8,
      "block_search_extent": 2
    },
    "additions_sound": {
      "sound": "ambient.underwater.loop.additions",
      "tick_chance": 0.0111
    },
    "music": {
      "sound": "music.under_water",
      "min_delay": 12000,
      "max_delay": 24000,
      "replace_current_music": true
    },
    "particle": {
      "options": {
        "type": "nautilus:bioluminescence"
      },
      "probability": 0.005
    },
    "foliage_color": 10387789,
    "grass_color": 9470285,
    "sky_color": 7972607,
    "fog_color": 12638463,
    "water_color": 4159204,
    "water_fog_color": 329011
  },
  "spawners": {
    "monster": [],
    "creature": [],
    "ambient": [],
    "axolotls": [],
    "underground_water_creature": [],
    "water_creature": [],
    "water_ambient": [],
    "misc": []
  },
  "spawn_costs": {},
  "carvers": {
    "air": [
      "minecraft:cave",
      "minecraft:cave_extra_underground",
      "minecraft:canyon"
    ]
  },
  "features": [
    [],
    [
      "minecraft:lake_lava_underground"
    ],
    [],
    [],
    [],
    [],
    [
      "minecraft:ore_coal_upper",
      "minecraft:ore_coal_lower",
      "minecraft:ore_iron_upper",
      "minecraft:ore_iron_middle",
      "minecraft:ore_iron_small",
      "minecraft:ore_gold",
      "minecraft:ore_gold_lower",
      "minecraft:ore_redstone",
      "minecraft:ore_redstone_lower",
      "minecraft:ore_diamond",
      "minecraft:ore_diamond_large",
      "minecraft:ore_diamond_buried",
      "minecraft:ore_lapis",
      "minecraft:ore_lapis_buried",
      "minecraft:ore_copper",
      "minecraft:underwater_magma"
    ],
    [],
    [],
    [],
    [
      "minecraft:freeze_top_layer"
    ]
  ]
}