I am trying to output some Woocommerce product fields here https://toolset.com/course-lesson/enabling-additional-woocommerce-fields-in-product-forms/ in a template—specifically I want to check if there are sale price dates set for a product, and output _sale_price (if it's not empty) and _sale_price_dates_to. I tried evaluating and outputting [types field='views_woo_sale_price'][/types] but that doesn't do anything...