Sort List inside Map in Flutter

In this endpoint http://www.caguascriollos.com/nuevaweb/wp-json/sportspress/v2/tables I'm getting a List of Maps. Inside each element, in the "data" key, I have another List. That List have a "pos" (position) key.

I want to sort each "data" depending on the "pos" value, but I'm getting the following error:

NoSuchMethodError (NoSuchMethodError: Class '_InternalLinkedHashMap<String, dynamic>' has no instance method 'sort'.
Receiver: _LinkedHashMap len:6
Tried calling: sort(LinkedHashSet len:1))

My code:

 final response = await http.get(Uri.parse('http://www.caguascriollos.com/nuevaweb/wp-json/sportspress/v2/tables'));
_positions = json.decode(response.body);

for (var _position in _positions!) {
  _position['data'].sort({
    (a,b) => {
      if (a.isInt() && b.isInt()) {
        a.toInt().compareTo(b.toInt())
      }
    }
  });
}

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