add "products_quantity_order_min" to strcutre data markup

Zencart 5.7
php 7.4

I am currently using zencart super data markup
https://www.zen-cart.com/downloads.php?do=file&id=1984

I need to add the field "products_quantity_order_min" into the structure data.

In the super_data_head.php the code is below.

I tried adddng this <?php Print $products_quantity_order_min; ?> but nothing ever populates.

Can someone assist me or lead me in the right direction on getting the min-order-quantity on the structure data

<script type="application/ld+json">


{

  "@context": "http://schema.org",

   "@type": "Product",

   "@id": "<?php echo htmlspecialchars_decode($canonicalLink, ENT_NOQUOTES); ?>",

    "brand": "<?php echo $manufacturers_name; ?>",

    "mpn": "<?php echo htmlspecialchars($products_model); ?>",

    "sku": "<?php echo $products_id; ?>",

    "url": "<?php echo htmlspecialchars_decode($canonicalLink, ENT_NOQUOTES); ?>",

    "name": "<?php echo htmlspecialchars($products_name); ?>",

    "description": "<?php echo META_TAG_DESCRIPTION; ?>",

    "image": "<?php echo $fb_image; ?>",


   "offers": {

    "@type" : "Offer",

    "availability" : "<?php if ($products_quantity > 0) { ?>http://schema.org/InStock<?php } ?><?php if ($products_quantity == 0) { ?>http://schema.org/OutOfStock<?php }?>",

    "price" : "<?php echo $specials_new_products_price = (round(zen_get_products_actual_price($product_info_metatags->fields['products_id']),2)); ?>",

    "priceCurrency" : "<?php if (FACEBOOK_OPEN_GRAPH_CUR != '') { ?><?php echo FACEBOOK_OPEN_GRAPH_CUR; ?><?php } ?>",

    "seller" : "<?php echo STORE_NAME; ?>",

    "itemCondition" : "http://schema.org/<?php if (FACEBOOK_OPEN_GRAPH_COND != '') { ?><?php echo FACEBOOK_OPEN_GRAPH_COND; ?><?php }?>",

    "inventoryLevel" : "<?php echo $products_quantity; ?>",    

    "deliveryLeadTime" : "<?php if (FACEBOOK_OPEN_GRAPH_DTS != '') { ?><?php echo FACEBOOK_OPEN_GRAPH_DTS; ?><?php }?>",

    "category" : "<?php echo htmlspecialchars($categories->fields['categories_name']); ?>",

    "itemOffered" : "<?php echo htmlspecialchars($products_name); ?>",

    "url": "<?php echo htmlspecialchars_decode($canonicalLink, ENT_NOQUOTES); ?>",

    "priceValidUntil": "<?php echo date('Y-m-d', strtotime("+30 days")); ?>",
     
    "eligibleRegion" : "<?php if (FACEBOOK_OPEN_GRAPH_ELER != '') { ?><?php echo FACEBOOK_OPEN_GRAPH_ELER; ?><?php }?>",

    "acceptedPaymentMethod" : [ "http://purl.org/goodrelations/v1#<?php echo FACEBOOK_OPEN_GRAPH_PAY1; ?>,http://purl.org/goodrelations/v1#<?php echo FACEBOOK_OPEN_GRAPH_PAY2; ?>,http://purl.org/goodrelations/v1#<?php echo FACEBOOK_OPEN_GRAPH_PAY3; ?>,http://purl.org/goodrelations/v1#<?php echo FACEBOOK_OPEN_GRAPH_PAY4; ?>,http://purl.org/goodrelations/v1#<?php echo FACEBOOK_OPEN_GRAPH_PAY5; ?>,http://purl.org/goodrelations/v1#<?php echo FACEBOOK_OPEN_GRAPH_PAY6; ?>" ]    


} 

}

</script>

As far as I can tell there's no such field for minimum product quantity in the official structured-data Product schema, so I'm not sure what your real goal is, nor "where" you believe it belongs in the generated structured-data output.

But ... to retrieve the value from Zen Cart:
Around line 114 is a list of fields being retrieved from the database. Add yours on a new line there. Be sure to include the comma which separates it from other fields.
Then you can refer to it like: $product_info->fields['your_field_name_here']

and then echo it into whatever part of the structured data json output you believe it belongs in.