How to add custom sort in Product GrqphQl query Magento 2?

I have a functionality where I have to display the bestseller products, so for this I am using Product query.
To full fill my requirement I am using one custom short attribute

products(
                search: "",
                sort: {trending: DESC},
                pageSize: ${params.limit ?? 12},
                currentPage: ${params.page}
            )

In Magento I have create a module which in which I am adding ProductAttributeSortInput in etc/schema.graphql

input ProductAttributeSortInput {
  trending: SortEnum! @doc(description: "Sort by trending products")
}

After running my code I am getting below error –
Field "trending" is not defined by type ProductAttributeSortInput

What I am doing wrong in this?

Or if you can share any sample using which I can get the bestseller products from Magento 2 using graphQl query.

Thanks in advance!!