Hi,

Well, for this one you need a bit work with the JS. 

1. Install and activate the plugins Insert Headers and Footers.
2. Add the following script in Settings > Headers and Footers.

<script>
jQuery(document).ready(function ($) {
  $('.o-neuron-hover .o-neuron-hover-holder .o-neuron-hover-holder__body > a').attr('target', '_blank');
});
</script>

Feel free to ask for anything you need.

Kind Regards,
NeuronThemes