You can run or add your custom scripts or actions on unit load on "unit_travaerse" event .
Example:
$('.unit_content').on('unit_traverse',function(){
//Your custom code
});
Write your scripts in the above function and add this script in wplms from wp-admin-> wplms -> Footer -> Google Anaylitics code:
<script>
$('.unit_content').on('unit_traverse',function(){
//Your custom code
});
</script>