Creating indexing for dot annotated dynamic path in firestore [Wildcard]?

I have my collection created as below:

-products
  -productID
    -category [object]
      catitem1 - boolean
      catitem2 - boolean

now I have written a query as below

this.afs.collection<Product>('products', ref =>
    ref
      .where(`category.${categoryName}`, '==', true)
      .limit(limit)
);

This query works fine but when I add orderBy to the above query, I am asked to create an index for the query.

this.afs.collection<Product>('products', ref =>
    ref
      .where(`category.${categoryName}`, '==', true)
      .orderBy('createdDate','desc')
      .limit(limit)
);

Since the categoryName can be created and can be changed at anytime, I am supposed to add indexing for each and every categoryName which would be in hundreds.

Is there any way where I can create a wildcard index for category.categoryName?

I tried using category.* but that's not acceptable. Hope to find some help here.

Since this question was asked, Firestore has implemented various operators to help with querying for array membership. The available operators at time of writing are: array-contains, array-contains-any, in, and not-in.

Instead of storing category as an object with a Boolean property for each categoryName, you could have a categories array that only contains the String names (or, if you want to save space, Int ids) of categories that the product is a member of.

The query could then work like this, which would require only a single index:

this.afs.collection<Product>('products', ref =>
    ref
      .where('categories', 'array-contains', categoryName)
      .orderBy('createdDate','desc')
      .limit(limit)
);