How to add custom detail page for a Subscriber at Admin Panel

It sounds like maybe you need to add a settings page,
(https://developer.wordpress.org/plugins/settings/custom-settings-page/)
This would be good if you had something really custom (customer user meta) and a layout that you wanted to keep separate from the regular user pages.

Otherwise, why not just link to the core wordpress user pages? Just build your links like WordPress does and pass the user_id into the query string.