biomes-gen-script.php

<?php

declare(strict_types=1);

require "vendor/autoload.php";

$outputData = [
    "ocean" => 0,
    "plains" => 1,
    "desert" => 2,
    "mountains" => 3,
    "forest" => 4,
    "swamp" => 5,
    "river" => 7,
    "hell" => 8,
    "ice_plains" => 12,
    "mushroom_fields" => 14,
    "jungle" => 21,
    "dark_forest" => 29,
    "savanna" => 35,
    "badlands" => 37,
];

echo json_encode($outputData);

Here's my updated version https://gist.github.com/dadodasyra/1bc99f23c8dfe2502db61c143e08190b