Add button to Sharepoint list to generate an email draft with selected users' emails in bcc

I'm currently trying to replicate in Sharepoint 365, via power automate, a functionality that I had developed in a JS snippet in the old sharepoint 2013 on a Email ditribution list page.

My snippet code was this:

   <input onclick="SendMailToSelcted();" type="button" value="Send E-Mail"> 
   <br> 
   <script language="javascript" type="text/javascript">
function SendMailToSelcted() {
var items = SP.ListOperation.Selection.getSelectedItems();
var ctx = SP.ClientContext.get_current();
var web = ctx.get_web();
var currentListGUID = SP.ListOperation.Selection.getSelectedList();

var list = web.get_lists().getById(currentListGUID);

var rows = new Array();
for(var i = 0; i < items.length; i++)
{                           
  var row = list.getItemById(items[i].id);
  ctx.load(row);
  rows.push(row);
}

ctx.executeQueryAsync(function ()
{                    
 var ids = '';
 for (var i = 0; i < rows.length; i++)
 {
   var r = rows[i];
   ids += r.get_item('cs6w') + ';'  ;
 }
 document.location='mailto:' + '?bcc=' + ids ;
},

function(sender, args)
{
  alert('Request failed. \nError: ' + args.get_message() + '\nStackTrace: ' + args.get_stackTrace());
});

}
</script> 

This snippet is no more allowed in my actual SP365.

The functionality was:

once selected different users  out of the sharepoint list (with email address availble on their records), when a button at the top of the list is clicked(snippet), an outlook email draft should be created with all selected users' emails filled in "bcc" field.

The user has to edit each time that generated email draft with subject and text and send it.

I'm now not aware how to replicate it in Sharepoint 365 List through power automate and its flows.

Any suggestion is really appriciated!

Thanks Max