channel tag is not displayed as notification message for all

I use this JavaScript code to send notifications to Slack channel:

function start() {
  const axios = require('axios');
  axios.post('https://hooks.slack.com/services/34234/13222/124124',
    {text: " :x: @channel message send! "})
    .then((response) => console.log(response))
    .catch((error) => console.log(error));
}

start();

But I receive @channel just as a simple text. It should be channel notification yellow. Do you know what might be the issue?