Using Javascript in the widget admin interface

Hi there. I’m building a bunch of custom widgets based on the SiteOrigin_Widget class.

This far it’s been working really well but now I need to do something a little bit more complicated and I’m having some trouble figuring out how to solve this.

Basically what I want is to include a datetime-picker for one of my widgets. As far as I’ve seen in the documentation there is no premade element in the SO_Widget form builder.

So my idea was to add a regular textfield to my widget and then through javascript target that textfield and attach a javascript datetimepicker of some sort (not sure exactly which one yet).

I have been able to get a javascript running in my admin by enqueueing a script in the inherited initialize-function from the base-class, like so:

function initialize() {
    wp_enqueue_script( 
      'featured-product', 
      get_template_directory_uri() . '/widgets/featured-product/js/featured-product.js', 
      array( 'jquery' ), // dependencies
      '1.0', // version
      true // on footer
    );
  }

Though I have a feeling that this is not the best approach to do this, it should work.
My first question is how would you suggest to go on about enqueuing scripts to use in my widgets admin interface?

Secondly I wonder if there is a simple way of targeting an element within the widget admin interface. Can in some way get the element id from the instance of my Widget class and pass it to my javascript? Or should I rather modify the textelement form field and add some kind of target that way?

Thank you so much for an awesome plugin!