How to send doc fields as parameter to the script?

[DaiZack]

Is it possible to send doc fields as parameter to the script?
e.g

PUT _scripts/levenshtein
{
  "script": {
    "lang": "painless",
    "source": """
      String a = params.a;
      String b = params.b;

      int[][] dp = new int[a.length() + 1][b.length() + 1];

      for (int i = 0; i <= a.length(); i++) {
        for (int j = 0; j <= b.length(); j++) {
          if (i == 0) {
            dp[i][j] = j;
          } else if (j == 0) {
            dp[i][j] = i;
          } else {
            int cost = a.charAt(i - 1) == b.charAt(j - 1) ? 0 : 1;
            int deletion = dp[i - 1][j] + 1;
            int insertion = dp[i][j - 1] + 1;
            int substitution = dp[i - 1][j - 1] + cost;
            int tempMin = (int) Math.min(deletion, insertion);
            dp[i][j] = (int) Math.min(tempMin, substitution);
          }
        }
      }

      int distance = dp[a.length()][b.length()];
      int maxLength = (int) Math.max(a.length(), b.length());
      return maxLength > 0 ? 1.0 - ((double) distance / (double) maxLength) : 0.0;
    """
  }
}

And use it dynamically

GET /duns_magic_v3_nj/_search
{
  "query": {
    "match_all": {}
  },
  "script_fields": {
    "name_sim_score": {
      "script": {
        "id": "levenshtein",
        "params": {
          "a": "kitten xyz",
          "b": "doc['name'].value"
        }
      }
    },
    "city_sim_score": {
      "script": {
        "id": "levenshtein",
        "params": {
          "a": "kitten xyz",
          "b": "doc['city'].value"
        }
      }
    }
  }
}