WooCommerce - Change quantity args for products across frontend

qty-limits.php

<?php

/**
 * @var array<int, array{
 *    input_value: int,
 *    max_value: int,
 *    min_value: int,
 *    step: int,
 * }|null> $product_args Array of qty data or null for default -  keyed by product ID
 */
$product_args = array();
$default_args = array(
    'input_value' => 10,
    'max_value'   => 20,
    'min_value'   => 6,
    'step'        => 2
);

add_filter('woocommerce_quantity_input_args', function($args, $product) use ($product_args, $default_args) {
    if ( ! in_array( $product->get_id(), $product_ids, true ) ) {
        return $args;
    }
    
    return array_merge(
        $args,
        $product_ids[ $product->get_id() ] ?? $default_args,
    );      
});