Custom endpoint filtering post by custom taxonomies

I am trying to create a custom endpoint by custom taxonomies, I have already created another for the categories and it works well, however there is something I cannot solve with this

function get_latest_posts_by_term($request) {

    $args = array(
            'term' = $request['term_id']
    );

    $posts = get_posts($args);
    if (empty($posts)) {
    return new WP_Error( 'empty_term', 'There are no posts to display', array('status' = 404) );

    }

    $response = new WP_REST_Response($posts);
    $response-set_status(200);

          $data = [];
          $i = 0;

    foreach($posts as $post) {
        $data[$i]['id'] = $post-ID;
        $data[$i]['title'] = $post-post_title;
        $data[$i]['excerpt'] = $post-post_excerpt;
        $data[$i]['date'] = $post-post_date;
        $data[$i]['content'] = $post-post_content;
        $data[$i]['slug'] = $post-post_name;
        $data[$i]['author'] = get_the_author_meta('display_name', $post-post_author);
        $data[$i]['category'] = get_the_category( $post-ID);  
        $data[$i]['theme'] = get_the_terms($post-ID,'theme');
        $data[$i]['Rute-geografic'] = get_the_terms($post-ID,'rute-geografice');
        $data[$i]['featured_image']['thumbnail'] = get_the_post_thumbnail_url($post-ID, 'thumbnail');
        
        $data[$i]['post_tags'] = get_the_terms($post-ID,'post_tag');
        
        
        
        $i++;
    }

    return $data;
}

add_action('rest_api_init', function() {
register_rest_route( 'wl/v1', 'posts/term/(?Pterm_id\d+)',array(
                'methods'  = 'GET',
                'callback' = 'get_latest_posts_by_term'
      ));
    
});