How to use {exp:query} results in {exp:channel} parameter?

{exp:channel:entries channel='channel-one' entry_id='        
        <?php
            $servername = 'blabla';
            $username = 'blabla';
            $password = 'blabla';
            $dbname = 'blabla';

            // Create connection
            $db = mysqli_connect($servername, $username, $password, $dbname);
            // Check connection
            if (!$db) {
            die("Connection failed: " . mysqli_connect_error());
            }
            
            $url_pieces = explode("/", $_SERVER['REQUEST_URI']);

            $sql = 'SELECT parent_id FROM exp_relationships WHERE child_id = '.$url_pieces[2].'';
            $result = mysqli_query($db, $sql);

            while($row = mysqli_fetch_array($result, MYSQLI_NUM)) {
                echo $row['0']."|";
            }
        ?>
    ' disable='categories|member_data|pagination|category_fields'}

{exp:channel:entries channel='channel-one' entry_id='        
            <?php
                $pieces = explode("/", $_SERVER['REQUEST_URI']);
                $sql = 'SELECT parent_id FROM exp_relationships WHERE child_id = '.$pieces[2].'';
                
                $query = ee()->db->query($sql); 
    
                if ($query->num_rows() > 0)
                {
                    foreach($query->result_array() as $row)
                    {
                        echo $row['parent_id']."|";
                    }
                }            
            ?>
    ' disable='categories|member_data|pagination|category_fields'}

{exp:query sql="SELECT parent_id FROM exp_relationships WHERE child_id = '{last_segment}'" backspace="1"}{parent_id}|{/exp:query}

{exp:channel:entries channel='channel-one' entry_id='{parents_ids}' disable='categories|member_data|pagination|category_fields'}