Below function will add the product image to the Description column. Micro template is not supported.
function add_product_image( $description, $item_id, $item ) {
$product = $item->get_product();
if ( $product ) {
$description = sprintf( '<table style="border:none;padding:0;margin:0;"><tr><td width="10%%" style="border:none;padding:0;"><img src="%s" width="50" height="50"/></td><td width="40%%" style="border:none;padding:0;text-align:left;">%s</td></tr></table>', wp_get_attachment_url( $product->get_image_id() ), $description );
}
return $description;
}
add_filter( 'wpi_item_description_data', 'add_product_image', 10, 3 );