Multisite: Display a reusable block with a shortcode?

I have a multisite network and I can use this to display a dashboard widget made up from a Gutenburg reusable block:

add_action('wp_dashboard_setup', 'my_custom_dashboard_widgets');
  
function my_custom_dashboard_widgets() {
global $wp_meta_boxes;
 
wp_add_dashboard_widget('custom_help_widget', 'Our Support', 'custom_dashboard_help');
}
 
function custom_dashboard_help() {
	
    // get reusable gutenberg block:
    $gblock = get_post( 135 );
    $block =  apply_filters( 'the_content', $gblock->post_content );	
	
	
	
echo '$block;

It displays the contents of the block ID=135 in the dashboard – but only in the site there I create the block.

Is it possible to do something like this that would let me create a block in the main site and have it visible in the dashboard of all of the other sub-sites?