wpgridbuilder custom queries in Generatepress

Hi, sorry if this out of generatepress scope of support.
I want to implement a custom query facet search with wpgridbuilder. There is a doc, https://docs.wpgridbuilder.com/resources/guide-filter-custom-queries/ but I don't know how to go about implementing in generatepress. Do I make a copy of content-page.php in childtheme and add the code? I don't know how to make it work. what needs to go in-between { ... }

if ( $the_query_1->have_posts() ) {

	echo '<ul class="wpgb-content-1">';
	while ( $the_query_1->have_posts() ) { ... }
	echo '</ul>';

}

Thank you!