Can we add Redis to Dart's get started web app?

I want to write my own program. For that I chose the Dart language and I used the tutorial: get started with a web app

My program to work needs a de-serialization of the data coming from Redis. And for the moment here it blocks.

An external python program serialize data with JSON and use lpush to send data on Redis.

I have a compilation error on web server and I can't get out of it.

//library db.redis;
import 'dart:html';
import 'dart:convert';
import 'dart:core';
import 'package:redis/redis.dart';
//import 'package:redis_client/redis_client.dart';
//import 'package:redis';

Iterable<String> thingsTodo() sync* {
    yield "walk the dog";
    yield "wash the dog";
}

LIElement newLI(String itemText) => LIElement()..text = itemText;

void main() {
    querySelector('#output')?.children.addAll(thingsTodo().map(newLI));
    const jsonString = '{"text": "Your app is running", "value": 1, "status": false, "extra": null}';

    final data = jsonDecode(jsonString);
    final conn = RedisConnection();

    //final client = await conn.connect('localhost');
    //conn.connect('localhost', 6379).then((Command command){
    //    command.send_object(["SET","key","0"]).then((var response)
    //        print(response);
    //    )
    //}

    //final client = await RedisClient.connect('localhost');
    //await client.set('name', 'Gabriel');

    //var res = await client.get('name');
    //print(res);

    //await client.close();

    querySelector('#end').text = data['text'];
}

When I try to add Redis, I always get an error message on the console with the webdev serve command.

The last:

[WARNING] build_web_compilers:entrypoint on web/main.dart: Skipping
compiling quickstart|web/main.dart with ddc because some of its transitive libraries have SDK dependencies that not supported on this platform:

redis|lib/redis.dart

https://github.com/dart-lang/build/blob/master/docs/faq.md#how-can-i-resolve-skipped-compiling-warnings