Injecting a SortDefinition into an IMongoQueryable

I’m building dynamic search/sort mechanism. I get my data as an IMongoQueryable<T>. I then build filters using Builders<T>.Filter

and apply them using Inject. E.g.

var filter = Builders<T>.Filter.Eq("Fieldname", "value");
items = items.Where(x => filter.Inject());

where items is an IMongoQueryable<T>.

Now if I do the same for sort, e.g.

var sort = Builders<T>.Sort.Descending("someProperty);

How do I apply the sort to my IMongoQueryable<T>? I found examples on how to use it when you have IMongoCollection<T> to work with, but this is not an option for me.