I think the group leader capabilities comes from the Learndash Plugin. Here is what LearDash says about user capabilities:

Below are the LearnDash user capabilities, which you can assign to other WordPress user roles (or custom roles) when using a plugin like User Role Editor.

group_leader ( both a role capability and user role)
enroll_users
// All Admin LD Assignment custom capabilities
read_assignment
edit_assignment
edit_assignments
edit_others_assignments
publish_assignments
read_assignment
read_private_assignments
delete_assignment
edit_published_assignments
delete_others_assignments
delete_published_assignments

// All Admin LD Quiz Essay custom capabilities
edit_essays
edit_others_essays
publish_essays
read_essays
read_private_essays
delete_essays
edit_published_essays
delete_others_essays
delete_published_essays

// All Admin LD Quiz custom capabilities
wpProQuiz_show
wpProQuiz_add_quiz
wpProQuiz_edit_quiz
wpProQuiz_delete_quiz
wpProQuiz_show_statistics
wpProQuiz_reset_statistics
wpProQuiz_import
wpProQuiz_export
wpProQuiz_change_settings
wpProQuiz_toplist_edit
wpProQuiz_toplist_edit
WordPress standard capabilities are also used. For example:

Access to the Users > All Users listing is controlled by WordPress. The user must have the ‘list_users’ capability.
When editing a user’s profile (not their own) the current user must have the ‘edit_users’ capabilities in order to see certain admin-level items like the ability to manually complete course steps or add a user to a group etc.
Access to the various LeandDash LMS sub-menus. For the custom post type like course, lesson, topic and quiz are set when the custom post type is registered. For example for courses the WP capabilities are mapped to the extended custom post type capabilities
read_course -> read_post
publish_courses -> publish_posts
edit_courses -> edit_posts

Can you help me with it?