How to show a notice to admin after “publish_post” ?

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I am developing a WordPress plugin.

Everything works properly, but I don’t know how to display a message to the admin:

function example_send_notifications( $post_id ) {
// do something (it works)

// then I need to display a success or failure message to the admin in the editor
// e.g. show_admin_message( ‘Notifications sent!’ );
}
add_action( ‘publish_post’, ‘example_send_notifications’, 10, 1 );

How can I achieve that (**display a message to the admin in the Gutenberg editor**)?

I would like the message to have a style similar to the “Post published” toast message that is displayed by WP in the bottom left corner.

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