Consider

Here is the intention it to pass along the selection to the underlying query (in other words, except for translating the searchString to its embedding, nothing should change). It is currently possible to inject Operation, take its selection (using the Field.query()), and form a GraphQL using that selection. But it is a tedious process. Instead we should allow a function (say, Field.selectionString()` so that developers can form their query and pass along this selection.