Quantity Selector doesn't work

Hi, I have a problem with using the quantity selector. I would need to put it in a product list, and for each record in the list I need this to show the quantity of the corresponding product (via the oData I configured). Once this is done I would like to change the value inside the quantity selector and other point by clicking the - / + buttons, the ideal would be to also update the database when the quantity changes.
But the update for the moment can also be neglected and implemented with a save button at the end of the changes.

Do you have any idea how to make this element work for my purpose?

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This is the list Iā€™m trying to implement: