Display post count of each subcategory

Hi, I'm using this code to display a list of subcategories:

ob_start();

$term_id = $atts['id'];
$taxonomy_name = 'category';
$term_children = get_term_children( $term_id, $taxonomy_name );

echo '<ul class="list-subcats">';

foreach ( $term_children as $child ) {
$term = get_term_by( 'id', $child, $taxonomy_name );
echo '<li><a href="' . get_term_link( $child, $taxonomy_name ) . '">' . $term->name . '</a></li>';
}

echo '</ul>';
return ob_get_clean();

got the code from here: https://generatepress.com/forums/topic/list-subcategories/

I want to display the post count next to each category name like this: Category(24), how do i do that?