gistfile1.txt

add_action( 'elementor/query/myonmarketpropertyquery', 'elementor_query_on_market_only' );
function elementor_query_on_market_only( $query )
{
    $meta_query = $query->get('meta_query');
    
    $new_meta_query = $meta_query;
    
    $new_meta_query[] = array(
        'key' => '_on_market',
        'value' => 'yes'
    );

    $query->set( 'meta_query', $new_meta_query );
}