Add `current_year` marcos to jet-engine

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

function __your_prefix_add_jet_engine_new_marcos( $list ) {
	$list['current_year'] = '__your_prefix_jet_engine_current_year_cb';

	return $list;
}

function __your_prefix_jet_engine_current_year_cb() {
	return mktime( 0, 0, 0, 1 , 1, date('Y') );
}