add-brand-images.php

<?php 

// Checkbox filters brand images
add_filter( 'wpc_filters_checkbox_term_html', 'wpc_term_brand_custom_logo', 10, 4 );
// Radio filters brand images
add_filter( 'wpc_filters_radio_term_html', 'wpc_term_brand_custom_logo', 10, 4 );

function wpc_term_brand_custom_logo($html, $link_attributes, $term, $filter)
{
    $img = '';

    // Desired taxonomy 'pa_brand'
    if( $filter['e_name'] !== 'pa_brand' ){
        return $html;
    }

    if( ! isset( $term->slug ) ){
        return $html;
    }
 
    // Term meta key 'image' that conitains term image src 
	$src = get_term_meta($term->term_id, 'image', true);
	if( $src ){
		$img  = '<span class="wpc-term-image-wrapper"><span class="wpc-term-image-container" style="background-image: url('.$src.')"></span></span>';
		$html = '<a '.$link_attributes.'>'.$img . ' '. $term->name.'</a>';
	}

    return $html;
}

?>