How to pass data from community site to webhook through automation?

you can try using the ajax call using the script to execute as javascript

var settings = {
  "url": "https://websiteurl.com/data/something",
  "method": "POST",
  "timeout": 0,
  "headers": {
    "Content-Type": "application/json"
  },
  "data": JSON.stringify({"subject":subject,"description":description}),
};

jQuery.ajax(settings).done(function (response) {
    
    alert("success " );
   
});
 
}).fail(function(data){
   
  alert("Failed due to error " + data.responseText );
});

we tried by implementing the above code in the .js and .jsm, to post data to webhook but it's not working.

we tried by implementing the above code in the .js and .jsm, to post data to webhook but it's not working.

Not sure how your webhook is configured to receive data from the sources , May be you need to create a custom widget api to do the job