CtsQueries allow to be enriched with cts:annotation-elements: https://docs.marklogic.com/guide/search-dev/cts_query#id_28038
Those elements are ignored by MarkLogic when the query is executed. cts:annotations can be used for various purposes (like documentation) and in our case we use it as a marker-element to identify certain parts of the query to be able to modify and manipulate them later after the creation.

Do the QueryBuilders support to add annotation-elements? (I searched, but didn't find it yet.)