A template for HexLands nether preset, based on vanilla, in 1.16.5

hexlands_nether.json

{
  "type": "minecraft:the_nether",
  "generator": {
    "type": "hexlands:hexlands",
    "seed": 555,
    "settings": "minecraft:nether",
    "biome_source": {
      "type": "hexlands:hexlands",
      "seed": 555,
      "biome_source": {
        "humidity_noise": {
          "firstOctave": -7,
          "amplitudes": [
            1.0,
            1.0
          ]
        },
        "altitude_noise": {
          "firstOctave": -7,
          "amplitudes": [
            1.0,
            1.0
          ]
        },
        "weirdness_noise": {
          "firstOctave": -7,
          "amplitudes": [
            1.0,
            1.0
          ]
        },
        "seed": 0,
        "biomes": [
          {
            "parameters": {
              "altitude": 0.0,
              "weirdness": 0.0,
              "offset": 0.0,
              "temperature": 0.0,
              "humidity": 0.0
            },
            "biome": "minecraft:nether_wastes"
          },
          {
            "parameters": {
              "altitude": 0.0,
              "weirdness": 0.0,
              "offset": 0.0,
              "temperature": 0.0,
              "humidity": -0.5
            },
            "biome": "minecraft:soul_sand_valley"
          },
          {
            "parameters": {
              "altitude": 0.0,
              "weirdness": 0.0,
              "offset": 0.0,
              "temperature": 0.4,
              "humidity": 0.0
            },
            "biome": "minecraft:crimson_forest"
          },
          {
            "parameters": {
              "altitude": 0.0,
              "weirdness": 0.0,
              "offset": 0.375,
              "temperature": 0.0,
              "humidity": 0.5
            },
            "biome": "minecraft:warped_forest"
          },
          {
            "parameters": {
              "altitude": 0.0,
              "weirdness": 0.0,
              "offset": 0.175,
              "temperature": -0.5,
              "humidity": 0.0
            },
            "biome": "minecraft:basalt_deltas"
          }
        ],
        "temperature_noise": {
          "firstOctave": -7,
          "amplitudes": [
            1.0,
            1.0
          ]
        },
        "type": "minecraft:multi_noise"
      },
      "biome_scale": 16,
      "hex_size": 28,
      "hex_border_threshold": 0.92,
      "border_state": {
        "Name": "minecraft:stone",
        "Properties": {}
      },
      "border_extends_to_bedrock": false,
      "windowed_border": true,
      "no_border": false
    }
  }
}