How to use facet_query in instantsearch.js typesense.

We are trying to include like         additionalSearchParameters: {
            query_by: 'title,location,category.level0,category.level1', 
            facet_query: 'filters !== '' ? 'category.level1:=' . filters : '',
        },

here filter is declared glocally inside script tag and gets updated with text whenever category.level0 facet value is selected. We atrying to filter facet category.level1

let filters = '';