How to get slug from S&F current_query() selected taxonomy?

Hi,

I have managed to return the selected taxonomy string when I filter the posts. I would like to know how can I return the slug also?

My code:

<?php
global $searchandfilter;

$sf_current_query = $searchandfilter->get(909)->current_query();

$sf_args = array(
    "str" 					=> '%2$s',
    "delim" 				=> array(", ", " - "),
    "field_delim"				=> ', ',
    "show_all_if_empty"			=> false
);

$current_selected_taxonomy = $sf_current_query->get_field_string("_sft_thema", $sf_args);
?>

<?= $current_selected_taxonomy ?>

Thanks!