[Question]: Include an icon in Admin Menu?

[Vodhin]

Question

Is there a way to include an Icon and/or <span> elements in a Plugin's Admin Menu?

What is documented:

protected $adminMenu = array(
    'estate_agencies/inbox' => array('caption'=> 'Agent Inbox', 'perm' => 'P')
    );

is there something like this:

protected $adminMenu = array(
    'estate_agencies/inbox' => array('caption'=> 'Agent Inbox', 'perm' => 'P', 'icon'=>'<i class="fa fa-envelope">3</i>')
    );

Expected Source

looked in core_functions.php and other places.

Additional Context

I would like to be able to add icons/counter to the buttons in the Admin Menu for my plugin, similar to how the e_dashboard.php file works.