I'm trying to exclude upsells using `post__not_in` but I already have a value and do not know how to combine the two.

I tried this: 

    'post__not_in' => get_upsell_ids(), [get_the_ID()]

But it is not working.

My code:

    function eligo_custom_related_products_by_label() {
        
        if (is_product() && has_term('records', 'product_cat')) {
    
            global $post;
    
            if ( ! $post ) {
    			return;
    		}
    
            $related_by_same_label = wp_get_post_terms($post->ID, 'pa_label', ['fields' => 'slugs']);
    
            $args = [
                'post_type' => 'product',
                'post_status' => 'publish',
                'orderby' => 'rand',
                'posts_per_page' => 4,
                'post__not_in' => [get_the_ID()],
                'tax_query' => [
                    'relation' => 'AND',
                    [
                        'taxonomy' => 'product_visibility',
                        'field'    => 'name',
                        'terms'    => array('outofstock'),
                        'operator' => 'NOT IN'
                    ],
                    [
                        'taxonomy' => 'pa_label',
                        'field' => 'slug',
                        'terms' => $related_by_same_label,
                        'operator' => 'IN',
                    ],
                ],
            ];
    
            $loop = new WP_Query($args);
    
            if ($loop->have_posts()) { ?>
    
                <section class="related products">
                    <div class="related__inner">
                        <?php
                        $attribute_names = ['pa_label'];
                        foreach ($attribute_names as $attribute_name) {
                            $taxonomy = get_taxonomy($attribute_name);
                            if ($taxonomy && !is_wp_error($taxonomy)) {
                                $terms = wp_get_post_terms($post->ID, $attribute_name);
                                $terms_array = [];
                                if (!empty($terms)) {
                                    foreach ($terms as $term) {
                                        $archive_link = get_term_link($term->slug, $attribute_name);
                                        $full_line = '<a href="' . $archive_link . '">' . $term->name . '</a>';
                                        array_push($terms_array, $full_line);
                                    }
                                    echo '<h3 class="section__title">' . esc_html__('More from', 'eligo') . ': ' . implode(', ', $terms_array) . '</h3>';
                                }
                            }
                        }
    
                        woocommerce_product_loop_start(); 
    
                        while ($loop->have_posts()):
                            $loop->the_post();
                            wc_get_template_part('content', 'product');
                        endwhile;
                        
                        ?>
                    </div>
                </section>
                <?php
    
            } 
    
            wp_reset_postdata();
        }
    }
    add_action('woocommerce_after_single_product_summary', 'eligo_custom_related_products_by_label', 20);

Thanks in advance.