let say i have routes like follow
web routes:
http://localhost:4000/department/:id/show
http://localhost:4000/department/:dept_id/user/:user_id
api routes:
http://localhost:4000/api/v1/department/:id/show
http://localhost:4000/api/v1/department/:dept_id/user/:user_id
and my module plug looks like

def call(%Plug.Conn{ params: %{ "dept_id" => dept_id } } = conn, _params) do
  logged_in_user = Guardian.Plug.current_resource(conn)
  result = MemberRepo.findUserBelongsToDept(logged_in_user, dept_id)
  case result do
    {:ok, 1} ->
      conn #user belongs to group continue
    {:ok, 0} ->
      IO.puts "#{conn}"
      conn
      |> put_status(404)

    {:error, error}->
      conn
end

On those routes which i mentioned above i was checking whether the user belongs to the department or not using above plug. if not it returns {:ok, 0}

i want to render 404.html for webpage and json response for api calls within the plug , how can i achieve this?