modx revo mSearch2 синтаксис условий where

[[!pdoPage?
    &element=`mSearch2`
    &parents = `14`
    &templates = `4`
    &minQuery = `1`
    &where = `[[!additionalParammSearch]]`
    &includeTVs = `image,price,old_price,new_good,sku,model,brand,quantity`
    &tpl = `SimpleSearchResult`
    &tplWrapper = `@INLINE  <div class="sisea-results-list box inline">
                                [[+output]]
                            </div>`
    &limit = `[[!#GET.count-search:default=`12`]]`
]]

<?php
$items_for_json= [];
if( isset($_GET['ff_price']) && is_array($_GET['ff_price']) ){
    $items_for_json[] = '"price:":'.(int)$_GET['ff_price']['min'];
}
$ret_param = "{" . implode(',', $items_for_json) . "}";
return $ret_param;