I am new to WP, and stuck in a shortcode. here’s my issue. created a shortcode like this

add_shortcode( 'position', 'object_position_in_post');
function object_position_in_post( $atts = [] ) {
    $atts = array_change_key_case( (array) $atts, CASE_LOWER );
    $format = $atts['format'];
    $position = get_post_meta( $product, '_target_position'.$post->ID, true);
    if(isset($atts['format']) && !empty($atts['format'])){
       if($format === 'num')
                return $position;
       if($format === 'word')
                $formatter = new NumberFormatter('en_US', NumberFormatter::SPELLOUT);
                return str_replace('-', ' ', $formatter->format($position));
     }
 return &position;
}

I need to use it on posts where multiple products are called in blocks using a loop; so how can I pass addition params so that it becomes dynamic and works flawlessly. shortcode should become something like this

[position format="what-was-passed" product_id='".$product->ID."' postid='".$post->ID."']  

Any help is highly appreciated;