URL to Post Archive of Custom Query

Answering my own question seems weird, but here is how I was able to achieve it –

function filter_posts_by_id($query) {
  if ( !is_admin() && is_post_type_archive('CPT_NAME') && $query->is_main_query()) {
    $post_ids = $_GET['post_ids'];
    if(!empty($post_ids)) {
        $pids = explode(',',$_GET['post_ids']);
        $query->set('post__in', $pids); 
    }
  }
}
add_action('pre_get_posts', 'filter_posts_by_id');

• PHP’s predefined variable $_GET[‘parameter’] to get the query string
• PHP’s explode() to convert comma-seperated query string to an array of post ids
• WordPress WP_query function $query->set(‘parameter’,$value) to set the wp query with the post_id filter
• Added the function to function.php of the theme and hooked with pre_get_posts so that the function runs before querying.
• Additionally set is_post_type_archive(‘post_type_name’) to specifically target my CPT

Hope it helps others who got stuck there! This is the first time I am playing with Queries, so the code might not be the best.