Filtering products by sub-categories in Sanity.io schema

export default {
  name: "products",
  type: "document",
  title: "Products",
  fields: [
{
      name: "categories",
      type: "reference",
      title: "Categories",
      to: {
        type: "category",
      },
    },

// other file

export default {
  name: "category",
  type: "document",
  title: "Product Categories",
  fields: [
    {
      name: "title",
      type: "string",
      title: "Title",
    },
  ],
};

S.listItem()
        .title("Products by category")
        .child(
          // List out the categories
          S.documentTypeList("category")
            .title("Product by page category")
            // When a category is selected, pass its id down to the next pane
            .child((categoryId) => {
              // load a new document list
              S.documentList()
                .title("Products")
                // Use a GROQ filter to get documents.
                // This filter checks for sampleProjects that has the
                // categoryId in its array of references
                .filter('_type == "products" && $categoryId in category[]._ref')
                .params({ categoryId });ddd
            })
        ),

S.listItem()
        .title("Products by category")
        .child(
          // List out the categories
          S.documentTypeList("category")
            .title("Product by page category")
            // When a category is selected, pass its id down to the next pane
            .child((categoryId) =>
              // load a new document list
              S.documentList()
                .title("Products")
                // Use a GROQ filter to get documents.
                // This filter checks for sampleProjects that has the
                // categoryId in its array of references
                .filter(
                  '_type == "products" && $categoryId in categories[]._ref'
                )
                .params({ categoryId })
            )
        ),

*[_type == "products" && "87a1892e-506b-4055-b6a5-972de7692ee5" in categories._ref]

                .filter('_type == "products" && references($categoryId)')