terms-macros.php

<?php

add_filter( 'jet-engine/listings/macros-list', 'jet_register_custom_macros' );

/**
 * Add new macros to default macros list
 *
 * %jet_current_category% - macros name
 *
 */
function jet_register_custom_macros( $macros_list ) {
	$macros_list['jet_current_category'] = 'jet_current_category';
	return $macros_list;
}

/**
 * Macros callback function
 */
function jet_current_category() {
	
	$terms = wp_get_post_terms( get_the_ID(), 'taxonomy_name' );

	if ( empty( $terms ) || is_wp_error( $terms ) ) {
		return null;
	}

	return $terms[0]->slug;
}