Question:

Low, is your low is changing per product, product category, supplier, or company.  In other word where do you plan to stock the value to compare to the quantity to define it low attributes

Then you can implement that compare in many way:

Add a calculated boolean field (store or not depending if you need it in search) on product.product called LowQuantity and use it on your view

You can also add a LowQuantity in that database (if the lowqty change per product this is the best place, if not make that field calculated or related to get the value) and use it in you view to compare

Last option you can create a OWL widget, but I dont see the gain, but it will work to