Model files in CI4

OK for the Model file, thanks.
But I still have some doubt on controller and libraries (the part that handles the model):

Previous version, in CI3, was:
File Home.php:

PHP Code:

// nothing on header

public function __construct()
{
 parent::__construct();
 $this->load->model('mymodel01');
}

public function index()
{
 $tableA = $this->mymodel01->read_file_aaaa();
 ...
} 


File Library01.php:

PHP Code:

class Library01
{
 protected $CI;
 public function __construct()
 {$this->CI =& get_instance();}

 public function some_subroutine()
 {
  $tableB = $this->CI->mymodel01->read_file_bbbb();
  ...
 }
} 


My new version, in CI4, is:
Home.php:

PHP Code:

use App\Models\Mymodel01;

class Home extends BaseController
{
 public function __construct()
 {static $G_Mymodel01;}

 public function index()
 {
  global $G_Mymodel01;
  $G_Mymodel01 = new \App\Models\Mymodel01();
  ...
  $tableA = $G_Mymodel01->read_file_aaaa();
  ...
 }
} 


Library01.php:

PHP Code:

use ??? // not yet checked

class Library01
{
 public function some_subroutine()
 {
  global $G_Mymodel01;
  ...
  $tableB = $G_Mymodel01->read_file_bbbb();
  ...
 }
} 


Is this correct?
I mean: it works (at least the controller; library not yet checked), but in this new version I have more code lines to write, instead of less. Maybe is there some "trick" that I haven't yet found?