curl --request GET \
  --url https://api.example.com/cabinet/admin/remnawave/squads/{squad_uuid}/migration-preview \
  --header 'Authorization: Bearer <token>'

{
  "squad_uuid": "<string>",
  "squad_name": "<string>",
  "current_users": 123,
  "users_to_migrate": 123,
  "max_users": 123
}