facetwp add additional classes/id to layout template

<?php
/** add additional classes / id to the facetwp-template div generated by a facetwp 
 ** layout template
 **/
add_filter( 'facetwp_shortcode_html', function( $output, $atts) {
	if ( $atts['template'] = 'example' ) { // replace 'example' with name of your template
    /** modify replacement as needed, make sure you keep the facetwp-template class **/
		$output = str_replace( 'class="facetwp-template"', 'id="masonry-container" class="facetwp-template small-up-1 medium-up-2 large-up-3"', $output );
	}
	return $output; 
}, 10, 2 );