I've implemented Google Analytics to Shopify and enabled enhanced e-commerce tracking. The E-commerce data is appearing correctly in GA. I noticed that for Add to cart, checkout etc.. events have been enabled for which Event Label is missing(e.g. ec=EnhancedEcommerce, ea=Added Product, el=(not set)). I would like to know where these events have been placed in the Shopify theme files so that I can add the Event labels too.