settings.php.json

{
  "hash_salt": "vWSbysR6MKt5TPhxu04S8arFqYzaXC4pEdlRLxjOXTxYp_SibKKQQbvT7UYFH1Lixf8RkpCVvg",
  "update_free_access": false,
  "container_yamls": [
    "\\/app\\/sites\\/default\\/services.yml"
  ],
  "file_scan_ignore_directories": [
    "node_modules",
    "bower_components"
  ],
  "entity_update_batch_size": 50,
  "cache": {
    "bins": {
      "render": "cache.backend.memory",
      "page": "cache.backend.memory",
      "dynamic_page_cache": "cache.backend.memory"
    }
  },
  "rebuild_access": true,
  "skip_permissions_hardening": true,
  "trusted_host_patterns": [
    "^.+\\.*\\.lndo\\.site/\\.*$",
    "."
  ],
  "file_chmod_directory": 509,
  "file_chmod_file": 436,
  "config_exclude_modules": [
    "devel",
    "kint",
    "stage_file_proxy",
    "reroute_email"
  ]
}

Add this to settings.php

// JSON to Settings experiment
function object_to_array($obj) {
    if(is_object($obj) || is_array($obj)) {
        $ret = (array) $obj;
        foreach($ret as &$item) {
        	$item = object_to_array($item);
        }
        return $ret;
    }
    else {
        return $obj;
    }
}

// Helper: Generate JSON from $settings variable
// $json = json_encode($settings);
// $fp = fopen('results.json', 'w');
// fwrite($fp, $json);
// fclose($fp);

// Use external JSON file to store $settings variable
$gist = 'https://gist.githubusercontent.com/theodorosploumis/';
$online_json = $gist . '68b6b2ca68e06c78cdb1566627c5eb29/raw/073b0df06fa33fae35aca9453e4c2d484ea019d1/settings.php.json';
$online_data = file_get_contents($online_json);
$online_settings = (array) json_decode($online_data);
$online_settings = object_to_array($online_settings);

// Finally, assign the JSON array data to $settings variable
$settings = array_merge($online_settings);

In order to convert PHP array to JSON you can use https://wtools.io/convert-php-array-to-json.