add/remove collection row inside the modal widget

Hi

I use a collection widget to show store products. After selecting a product, a modal form pens for showing other product specifications, in this step user can add product to her/his cart. If already the product exists in her/his cart, I show remove/edit button. For remove button, Item to remove is $item, but it doesn’t work.

I doubt this is because of modal, is it true?

I already have used collocation remove button, but now it doesn’t work.

I use Bonita Community version 2021.1.

Many thanks for your time.