@proyest,
LifterLMS currently does not have a function designed to output this information.
However, if you’re willing to write a bit of custom code — maybe a shortcode — you could use our student query methods to locate the information:
$course_id = 123; // your course ID here
$query = new LLMS_Student_Query( array(
'post_id' => $course_id,
'statuses' => 'enrolled'
'per_page' => 1, // we can only grab a single student because we'll use the total found results to display the number of actual students
) );
$num_students = $query->found_results; // this will be the number of students in the course
