I want to add extra sort options in backend these options are below

1. All Sizes on top
2. Minimum 1 sizes on top
3. Top Discounted Product (discount percent)

and i have used this code to add other sort options here is my code.

etc/di.xml

<type name="Magento\VisualMerchandiser\Model\Sorting">
        <plugin name="RLTSquare_VisualMerchandiser_Plugin_VisualMerchandiser_Model_SortingPlugin"
                type="RLTSquare\VisualMerchandiser\Plugin\VisualMerchandiser\Model\SortingPlugin" sortOrder="10"/>
    </type>

\RLTSquare\VisualMerchandiser\Plugin\VisualMerchandiser\Model\SortingPlugin.php

<?php
declare(strict_types=1);

namespace RLTSquare\VisualMerchandiser\Plugin\VisualMerchandiser\Model;

use RLTSquare\VisualMerchandiser\Model\VisualMerchandiser\Sorting\DateBottom;
use RLTSquare\VisualMerchandiser\Model\VisualMerchandiser\Sorting\DateTop;
use RLTSquare\VisualMerchandiser\Model\VisualMerchandiser\Sorting\BestSelling;
use RLTSquare\VisualMerchandiser\Model\VisualMerchandiser\Sorting\MostPopular;
use RLTSquare\VisualMerchandiser\Model\VisualMerchandiser\Sorting\DiscountBottom;
use RLTSquare\VisualMerchandiser\Model\VisualMerchandiser\Sorting\DiscountTop;

use RLTSquare\VisualMerchandiser\Model\VisualMerchandiser\Sorting\LowStockBottom;

use Magento\VisualMerchandiser\Model\Sorting;
use Magento\VisualMerchandiser\Model\Sorting\SortInterface;

class SortingPlugin
{
    /**
     * @var SortInterface[]
     */
    protected array $sortingOptions = [];

    /**
     * @param DateBottom $dateBottom
     * @param DateTop $dateTop
     * @param BestSelling $bestSelling
     * @param MostPopular $mostPopular
     * @param DiscountBottom $discountTop
     * @param LowStockBottom $lowStockBottom
     */
    public function __construct(
        DateBottom $dateBottom,
        DateTop $dateTop,
        BestSelling $bestSelling,
        MostPopular $mostPopular,
        DiscountBottom $discountBottom,
        DiscountTop $discountTop,
        LowStockBottom $lowStockBottom
    ) {
        $this->sortingOptions[20] = $dateBottom;
        $this->sortingOptions[21] = $dateTop;
        $this->sortingOptions[22] = $bestSelling;
        $this->sortingOptions[23]= $mostPopular;
        $this->sortingOptions[24]= $discountTop;
        $this->sortingOptions[25]= $discountBottom;

        $this->sortingOptions[26]= $lowStockBottom;
    }

    /**
     * @param Sorting $subject
     * @param array $result
     * @return array
     */
    public function afterGetSortingOptions(Sorting $subject, array $result): array
    {
        foreach ($this->sortingOptions as $idx => $instance) {
            $result[$idx] = $instance->getLabel();
        }

        return $result;
    }

    /**
     * @param Sorting $subject
     * @param callable $callback
     * @param $sortOption
     * @return SortInterface
     */
    public function aroundGetSortingInstance(Sorting $subject, callable $callback, $sortOption): SortInterface
    {
        if (isset($this->sortingOptions[$sortOption])) {
            return $this->sortingOptions[$sortOption];
        }

        return $callback($sortOption);
    }
}

\RLTSquare\VisualMerchandiser\Model\VisualMerchandiser\Sorting\LowStockBottom.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace RLTSquare\VisualMerchandiser\Model\VisualMerchandiser\Sorting;

use Magento\Framework\DB\Select;
use Magento\Catalog\Model\ResourceModel\Product\Collection;
use Magento\Framework\Data\Collection as CollectionAlias;
use Magento\Framework\Exception\LocalizedException;
use Magento\VisualMerchandiser\Model\Sorting\SortAbstract;
use Magento\VisualMerchandiser\Model\Sorting\SortInterface;
use Zend_Db_Select;
/**
 * Rearrange product positions in category grid/tile view based on the stock ascending order
 */
class LowStockBottom extends SortAbstract implements SortInterface
{
    const XML_PATH_MIN_STOCK_THRESHOLD = 'visualmerchandiser/options/minimum_stock_threshold';

    /**
     * Sort low stock on top for products in category
     *
     * @param Collection $collection
     * @return Collection
     * @throws LocalizedException
     */
    public function sort(
        Collection $collection
    ): Collection {
        if (!$this->moduleManager->isEnabled('Magento_CatalogInventory')) {
            return $collection;
        }

        $minStockThreshold = (int)$this->scopeConfig->getValue(self::XML_PATH_MIN_STOCK_THRESHOLD);

        $baseSet = clone $collection;
        $finalSet = clone $collection;

        $collection->getSelect()
            ->having('stock <= ?', $minStockThreshold)
            ->reset(Zend_Db_Select::ORDER)
            ->order('stock ' . $collection::SORT_ORDER_DESC);

        $resultIds = [];

        $collection->load();

        foreach ($collection as $item) {
            $resultIds[] = $item->getId();
        }

        $ids = array_unique(array_merge($resultIds, $baseSet->getAllIds()));

        $finalSet->getSelect()
            ->reset(Zend_Db_Select::ORDER)
            ->reset(Zend_Db_Select::WHERE);

        $finalSet->addAttributeToFilter('entity_id', ['in' => $ids]);
        if (count($ids)) {
            $finalSet->getSelect()->order(new \Zend_Db_Expr('FIELD(e.entity_id, ' . implode(',', $ids) . ')'));
        }
        $finalSet->getSelect()
            ->reset(Zend_Db_Select::ORDER)
            ->order('stock ' . $finalSet::SORT_ORDER_DESC);
        return $finalSet;
    }

    /**
     * Get label for the Filter
     *
     * @return string
     */
    public function getLabel(): string
    {
        return __("Move low stock to Bottom");
    }
}

• By following this approch i want to add these sort options as you can see in picture above

1. All Sizes on top
2. Minimum 1 sizes on top
3. Top Discounted Product (discount percent)

• How to do this any idea?